Abstract: An electrophotographic copier with an endless photoconductor belt adapted to move around a cylindrical drum and a flat platen. A vacuum column is positioned between the cylindrical drum and the platen. The vacuum column creates a concave bend in the photoconductor, enabling a latent image of a document to be placed on a flat run of the photoconductor belt, and enabling charging, developing, transferring and cleaning of the photoconductor belt to occur about a curved run of the photoconductor belt.

Abstract: Formation of planar conductor/insulator semiconductor devices utilizing hafnium coated aluminum based metallization with a magnesium oxide mask for dry etching of the metallization and deposition of planar insulation.The hafnium coating is used to protect the aluminum metallization during mask removal, and as a registration enhancer for subsequent electron-beam processing.

Abstract: A receiver for demodulating a single sideband signal which is subject to rapid phase jitter employs a Hilbert splitter for obtaining the Hilbert transform of the single sideband signal, and a local oscillator for signal demodulation. A post-oscillator feedback loop instantaneously derives the amount of phase jitter in the single sideband signal, and employs the derived phase jitter to adjust the phase of the local oscillator so that the local oscillator tracks the single sideband signal.Instantaneous derivation of the phase jitter is obtained because all post-oscillator signal manipulations are algebraic; post-oscillator Hilbert transform generation is not required. A first embodiment derives the exact amount of phase jitter. A second embodiment, more simple than the first, derives the approximate amount of phase jitter.

Abstract: Groups of stations operate in TDMA mode relative to associated frequency-separated transponder segments of a satellite repeater. Stations at radio signaling modes in all groups key to a common frame timing reference. The TDMA frame is partitioned repetitively into IN GROUP and CROSS GROUP intervals, each susceptible of containing multiple demand assignable burst time slots. Each node may transmit TDMA bursts (of time compressed and time multiplexed information signals) in assigned slots in either interval (or both). Such bursts are carried only on the transponder radio frequency associated with the respective group. Station receivers are adaptive to switch local oscillator frequencies in synchronism with transitions between IN GROUP and CROSS GROUP periods, and thereby adaptive to receive signals from stations in both groups.

Abstract: A dielectrically isolated semiconductor device can be manufactured. The structure is useable for integrated circuits, including field effect and/or bipolar transistors, wherein a significant savings in surface area and reduction in capacitances can be obtained over prior techniques. The method involves forming a layer of dielectric material upon a semiconductor body, having a diffused region where a bipolar device is to be formed, and then forming an opening in the layer to expose a part of the surface of the diffused region of the semiconductor body. An epitaxial layer of silicon is deposited on top. Single crystal silicon will grow over the exposed silicon area and if a diffused region is present in the substrate a pedestal will outdiffuse through the same area from the buried diffused region. Polycrystalline silicon will grow on top of the dielectric material. The pedestal is formed in a single crystal epitaxial layer of another impurity type.

Abstract: A bandgap reference voltage generator consists of a plurality of transistors with the same geometry. This circuit provides a stable temperature-compensated low reference voltage on the order of two volts.

Abstract: In a TDMA satellite communication system, one of the stations is elected the primary station which transmits a reference burst to all other stations to synchronize the local clocks in each station. Each subsidiary station in turn responds by transmitting a local transmit reference burst to enable synchronization of the local transmit clocks. In order to assure that the synchronous operation of the network will continue when the reference station experiences a failure, an alternate reference station is designated in the network which will assume the role of the primary reference station in a baton passing operation in the event that the existing primary reference station must abdicate its reference role. An improved method and apparatus for carrying out the baton passing operation monitors the channel error rate at the reference station and the alternate station.

Abstract: A multielement magnetic head is formed with a closure section having a nonmagnetic ceramic substrate on which a thin layer of magnetic ferrite is deposited and processed. The thin ferrite layer is cut to define the separate transducing elements and data track separation. The closure section is joined to a wafer formed from a ferrite substrate and a thin film conductive coil means.

Abstract: A data-processing system is connected to a peripheral system by a plurality of channel paths. These channel paths are named as members of path groups. Each path group has one or more channel paths. Within each path group, communications between the data-processing system and the peripheral system are multipathed among the paths in such path groups. Devices within the peripheral system are selectively assignable to access groups for exclusive use within one or more of such path groups; a given path group selectively provides communication paths for each device in an access group. Each access group includes one or more path groups. Temporary suspension and reassignment facilities are disclosed. Both devices and channel paths can be either in a grouped or ungrouped state. The assignment function to access groups is particularly useful in interleaved channel transfers for ensuring subsystem integrity.

Abstract: For record carriers with a greatly varying thickness of the metal layer, the burn out process is effected dynamically with respect to the current strength. During the starting phase up to the beginning of the actual arcing phase a relatively high current is applied which is sufficient to burn out even thick metal layers. As burning out proceeds, the print current, after a particular arc voltage has been reached, is reduced in a short time, maintaining the arc and avoiding an undesirable burning out which would increase the print spot. For thinner metal layers the burn out current is correspondingly lower. The maximum burn out current is automatically adjusted to the thickness of the metal layer by measuring the arc voltage between electrode and metal surface of the record carrier. Suitable arrangements for controlling the burn out current are characterized by an (arc) voltage-controlled current control circuit.

Abstract: There is disclosed apparatus for implementing a technique of shingling a stack (10) of cut sheets using fluid jets. Air (34), or other fluid under pressure, travels through a drum having exit holes arranged about its periphery. The passage of the air causes the drum (30) to self-propel. As each fluid jet contacts the uppermost sheets in the stack, a roll-wave is created. Continued rotation of the drum causes a fluid jet to describe a linear path relative to the stack surface.

Abstract: Device for separating and feeding sheets in seriatim from a stack to a processing station. The device includes a pin which periodically contacts and forms a pivot point on the stack. A rotary wave generator is disposed to rotate about the pivot point. The rotary wave generator periodically contacts a topmost sheet in the stack and shingles (that is separates) the sheet from the stack. The shingled sheet is fed into a paper sheet aligner and into the processing station. A variable or ramped force and/or a variable velocity is applied to the shingler. The force and/or velocity begins at a relatively low value and increases until a sheet is sensed downstream from the stack. This enables the feeding of a wide range of paper types and weights.

Abstract: A logic performing cell for use in array structures is provided which allows greater density fabrication in integrated circuits and reduces operational delays. The array has a plurality of output lines intercepted by a plurality of orthogonally oriented input lines, with elements in the form of a three terminal device located at each of the intersections of the input and output lines so that logical functions are performed on interrogation signals placed on the input lines and the responses thereto placed on the output lines. The three terminal device transfer gates are connected in groups of series strings which are connected in parallel to a recombination line. These groups of series connected transfer gates comprise a programmed mix of enhancement and depletion devices. Each logic function of each group of transfer gates establishes an output which, when coupled to the recombining output circuit line, provides an overall logic function for the logic performing cell.

Abstract: A transport system is disclosed, including an air film shuttle conveyor for conveying semiconductor chips from a loading to an unloading station, the conveyor comprising a base plate and upstanding side guide walls extending longitudinally of the base plate, the guide walls being spaced apart a distance slightly greater than the lateral dimension of said chips; further included are means providing a laminar air flow which surrounds the chips and forms an air film supporting them and propelling them downstream such that the slight spacing between the chips and the guide walls causes the flow resistance to be higher in the one region defined by said slight spacing than in the region defined by the spacing between the chips, whereby a continuous and flexible separation action occurs between the chips.

Abstract: A system is disclosed for compensating for the offset voltage problem which occurs in certain types of differential amplifiers; a differential amplifier, in the form of an operational amplifier, is provided with two generators of input signals whose difference is to be amplified; further included is an offset voltage compensation loop comprising a comparator, an n-bit up/down counter and a digital analog converter means; the output of said means being connected to said generators of input signals so as to modulate the input signals; and said digital analog converter means including first and second n-1 bit digital analog converters.

Abstract: A peripheral processing controller controls access to a peripheral memory by specialized peripheral devices. The specialized peripheral devices process all of the data independently of a central processor that simply supervises the system. The controller uses Memory Address Registers (MARs) to control the access to the memory by the peripheral devices. Each peripheral device selects a MAR, and each MAR includes a mode register. The start address and mode are set in each MAR by the supervising central processor. Also, each peripheral device is set by the processor to select a MAR. When the controller grants each peripheral device access to the peripheral memory, the peripheral device uses whatever mode and starting address has been initialized for the MAR selected by the device. Each time the device accesses the memory, the address in the MAR is incremented so the MAR is ready for the next access. In this way, a peripheral device will advance through a block of memory space.

Abstract: In the practice of this disclosure, rare earth disilicide low Schottky barriers (.ltorsim.0.4 eV) are used as low resistance contacts to n-Si. Further, high resistance contacts to p-Si (Schottky barrier of .gtorsim.0.7 eV) are also available by practice of this disclosure. A method is disclosed for forming contemporaneously high (.gtorsim.0.8 eV) and low (.ltorsim.0.4 eV) energy Schottky barriers on an n-doped silicon substrate. Illustratively, the high energy Schottky barrier is formed by reacting platinum or iridium with silicon; the low energy Schottky barrier is formed by reacting a rare earth with silicon to form a disilicide. Illustratively, a double layer of Pt/on W is an effective diffusion barrier on Gd and prevents the Gd from oxidation.

Abstract: A contact structure in a double polysilicon device is described in which direct shorts between overlying polysilicon conductors due to a "polysilicon void phenomenon" is overcome by patterning an appropriate etch stop between the conductors.

Abstract: A time base signal for controlling the recording of binary data is developed by measuring the velocity of a magnetic record.The velocity is measured by providing an inductive read head and a magnetoresistive read head which sense the same flux field on the magnetic record. The difference in the outputs of these read heads is a measure of the record velocity.

Abstract: A driver circuit to limit the di/dt downgoing transition to a desired value employs an active feedback path. The driver circuit utilizes a Schottky Barrier Diode as a current bleed to limit the base current of the drive circuit transistor. The active feedback path includes a normally conductive transistor which turns off when the output falls to a predetermined level. Elimination of the active feedback path in this condition insures maximum DC drive.

Abstract: An image represented by an array of digitally valued picture elements is selectively reduced or expanded in size by the extraction or insertion of spaced apart rows and lines of picture elements, at positions which are the closest approximation to the newly scaled base, whether smaller or larger. In reproducing a given image, for example, the image may be concurrently or successively scanned by an array of photo detector elements and a plurality of digitally valued picture elements corresponding to grey scale values across the image, and distributed with a given resolution, may be generated. These values may be processed in real time, or stored in a comparable array for subsequent processing. In either event, the number of rows and lines in the array are modified in accordance with the desired scale factor, and these discrete changes are introduced at the closest approximation to optimum positions.

Abstract: Task dispatching for an asymmetric or symmetric multiprocessor system is provided where all the processors are dispatched from a single task dispatching queue. The workload, i.e. tasks, of the multiprocessor system is distributed to the available processors. Each processor includes a task dispatcher and a signal dispatcher. The signal dispatcher runs in a processor whenever a task dispatching element (TDE) is put on the task dispatching queue (TDQ) as a result of the task running in the processor. The signal dispatcher examines the TDEs enqueued on the TDQ and determines if any task dispatcher should be invoked, i.e. if any processor is running a lower priority task a task switch should occur. If so, it signals the selected processor to invoke its task dispatcher. After completing the task switch, the selected processor must invoke its signal dispatcher to determine if the task it had been performing should now be performed on some other processor in the multiprocessor system.

Abstract: The present invention describes conformable masking techniques which can be successfully made and used in a practical manufacturing environment while providing increased resolution of photolithographic images while eliminating all manner of defects that might presently be encountered in the masks currently used in the semiconductor industry.In the present invention a body is first coated with a positive photoresist overcoated with a conformable mask which is exposed through a fixed mask and developed to define a replica of the fixed mask, together with all its defects. The underlying photoresist is then exposed to light through developed openings in the conformable mask. The conformable mask is then stripped and a new conformable mask laid down. This new conformable mask is now exposed through a second fixed mask having the same image as the first fixed mask, but presumably with different defects and developed to define a replica of the second mask.

Abstract: The disclosure is directed to a method and apparatus for superfinishing magnetic disk substrates using a non-friable polishing pad including a high density polyurethane foam binder in which at least 50 percent by weight of classified hard particles are retained. Polishing occurs by rotating the pad against the surface to be ultrafinished in the presence of a water soluable liquid vehicle maintaining a minimum pressure of 5 pounds per square inch at a rotational speed that achieves the desired aggressiveness of the polishing media. The method and apparatus contemplate both the ultrafinishing of newly prepared substrate disks and the restoring of previously coated disks to a ultrafinished substrate condition without producing substances or conditions toxic to the ecology or the operator.

Abstract: A swap gate for ion-implanted contiguous disk bubble devices using folded minor loops is disclosed. The bubble device has a major loop, a folded minor loop and a swap element positioned between the major loop and the folded end of the minor loop. The swap element has a first portion for interchanging bubbles with the major loop, a second portion for receiving bubbles from a first region of the folded end of the minor loop, and a third portion for transferring bubbles from the first portion to a second region of the folded end of the minor loop. The folded end of the minor loop also has a third region positioned between the first and second regions to form two bubble storage locations. The bubble device has a conductor associated with the major loop and the first portion of the swap element to form a first transfer gate. The device also includes a second conductor associated with the folded minor loop and the second portion of the swap element to form a second transfer gate.

Abstract: An electrostatic clutch operable by the Johnsen-Rahbek effect, which may be used to operate, e.g., a print hammer device, is described, said clutch comprising a rotatable drum and a band engagable therewith, wherein the engagable surface of the drum is a semiconductive surface prepared by sputtering or vapor depositing a layer of substantially pure silicon carbide onto a conductive substrate.

Abstract: A multiprocessor (MP) system is described having central processors (CPs) in which each CP has a store-in-cache (SIC) with an associated processor directory (PD). Each PD has a plurality of line entries which define the content of corresponding line positions in the associated SIC. Each line entry has an associated data shareability control bit, designated EX, which may be set to a one or zero state to indicate, respectively, the exclusive (EX) or readonly (RO) state of the associated line. An exclusive line is not shareable, but a readonly line is shareable i.e. may exist validly in more than one SIC in the MP. Any CP in the MP can request data in an EX state from its SIC, which data may or may not be found in its SIC or in another CP's SIC.

Abstract: A word line selection circuit includes a conventional Schottky diode decoder and a driver transistor which is connected to a word line. A word line is selected when the transistor is conductive and all associated diodes of the decoder are off. The base current of the driver transistor is defined by a control transistor whose conductivity is opposite to that of the driver transistor and which applies the selection current to the base of the driver transistor. A regulating transistor forms a current mirror with the control transistor to regulate the selection current. A compensation circuit associated with the regulating transistor modulates the collector current of the regulating transistor as a function of the driver transistor factor.

Abstract: An impact printing mechanism is disclosed having an electrostatic clutch assembly, including a rotatively mounted semiconductive coated drum and a conductive band wrapped around the circumference thereof. The printing mechanism includes a printing hammer and a print spring for actuating the printing hammer. When a print command is issued, a voltage is applied to the band to create a field between the band and the drum coating. An electrostatic force is therefore generated when the drum is rotating slowly or synchronous with the drum step motion. That motion will pull the band and compress the print spring. The potential energy stored in the spring is then ready to fire the hammer. A hammer firing command turns off the voltage pulse and discharges the field, releasing the electrostatic holding force instantaneously and firing the hammer by the compressed spring.

Abstract: Integrated read-only memory including nxm memory cells located at the intersections of m bit lines and n word lines in which binary information of a first type is represented by the presence of a connection to a transistor in a cell, the base of said transistor being connected to a word line while its emitter is connected to a bit line, and in which binary information of a second type is represented by the absence of a connection to a transistor in a cell, said memory being of the type in which reading is ensured by means of m read transistors the emitters of which are connected to the bit lines while their bases are connected to a reference voltage supply, the improvement comprising read transistors arranged into k adjacent sets of m/k consecutive elements, k being an integer submultiple of m, the transistors of each set being provided in the same collector epitaxial bed in a semiconductor substrate with a collector contact common to all the transistors, the collector contact of each set being connected to a

Abstract: A peripheral subsystem, such as a tape storage subsystem, assigns logical and physical values to blocks of signals received from a host. A host can retrieve such values for use later to locate the blocks of signals and for error recovery purposes. In a buffered peripheral subsystem, such values define current signal transfer status of the buffer.

Abstract: A structure for shaping or masking energetic radiation is described. The structure comprises a shallow silicon body having at least one through opening, and a metal silicide layer covering the surface of the structure. The structure characterized by having a high mechanical, and thermal stability may be used particularly in electron and X-ray lithography. More specifically, the structure may be used as an aperture for electron beams, or as a mask for X-rays. The production of the structure includes the steps of making through openings in the silicon body, and the forming of the silicide layer by vapor depositing a metal on the surface of the silicon body and by subsequent annealing.

Abstract: A method and apparatus for verifying both the content of a transaction and the identity of the parties thereto. The system includes a plurality of terminals connected together over a common communication channel wherein a given pair of users located at different terminals on the system have exchanged a contract comprising a plurality of reference signatures each of which constitutes the final member of a one-way keyed signature sequence and each of which is a one-way function of each user's secret encryption key (K.sub.x) and a number (NUM) known to both parties. Each terminal connected to the system includes means for generating a multidigit ranking vector which is a cryptographic function of the entire message (DATA) tobe transmitted.

Abstract: An elongated member is provided in the discharge orifice of a spray head nozzle so that the fluid being sprayed is discharged as a hollow stream resulting inter alia in a better and more complete atomization of the fluid in coaction with a low pressure propellant.

Abstract: A word processing system is disclosed in which a text stream is stored for recall and editing. The characters in the text stream can be derived from a number of keyboard character sets but each character must be identified according to its character set to be properly printed or displayed. When the system operator moves, copies or deletes blocks of text the correct keyboard character sets must be maintained. When blocks of text are inserted or deleted the keyboard character sets are determined for the interfacing text blocks. When there is a transition from one keyboard character set to another, a character set change code is inserted to indicate the correct keyboard character set for the immediately following text.

Abstract: The electronic controls for a typewriter disclosed herein allow the operator to erase a character using automatic erase capability such as disclosed in U.S. Pat. No. 3,780,846 and at the same time to remove any underscores associated with that character. When an underscore command is entered the memory which stores the code representing the characters typed is caused to be altered in its content to indicate upon the reading of that code segment that the character has been underscored and that the character must be erased along with the underscore. The apparatus accomplishes multiple erase cycles to remove the underscore and then the character. In proportional space mode of operation it is possible that multiple underscore erase cycles will be necessary to remove an underscore which is wider than the underscore type font on the type element.

Abstract: Resources shared by plural users supply a busy signal to a requesting user whenever any one of the users has a right of access to the resources. Ancillary data accompanies the busy signal identifying the user having the right of access. The requesting user may use the ancillary data to adjust its right of access by communication with the one user. The right of access may include a queue of access requests, each request having the ancillary data.

Abstract: A fuser roll apparatus in a toner fixing station associated with an electrophotographic or xerographic device for fixing a toner image onto a copy sheet by the application of heat and pressure. The fusing apparatus includes a pair of fuser rollers and a linkage mechanism coupling a control cam and the fuser rollers. An electromechanically operated latch, in the form of a solenoid, is interposed in the linkage mechanism coupling the control cam and fuser rollers. So long as the solenoid is energized, the opening of the rollers is controlled solely by the rotation of the cam. If the solenoid is deenergized however, the rollers are maintained in an open position. Thereafter, until the solenoid is again energized, the rollers remain open and are unaffected by rotational movement of the cam.

Abstract: Controlling Al.sub.2 Cu precipitation in copper doped aluminum by evaporating the aluminum metallurgy containing 3 to 4% copper at about 210.degree. C. on SiO.sub.2 coated semiconductor devices. In multilevel metallurgy sintering can be optionally performed at 400.degree. C. for 75 minutes to cause intermetal diffusion at vias between the metallurgy levels.

Abstract: Disclosed is drive apparatus especially useful for controllably displacing the carrier of a printer, the drive apparatus including a lead screw having laterally spaced apart and floating threaded followers thereon. Intermediate the threaded followers are a first pair of preloaded springs which press the followers against the opposite flanks of the threads on the lead screw to thereby inhibit backlash intermediate the followers. A second pair of springs are mounted intermediate a bracket, which is fastened to the carrier, and at least one of the followers for effecting coupling between the carrier and the follower while controlling backlash therebetween. A pair of arms extend from the followers and are coupled to a restraining shaft in such a manner as to inhibit rotational movement of the arms (and thus the followers) while permitting motion of the followers in any perpendicular direction to the lead screw to accommodate runout or eccentricity.

Abstract: A record carrier for electro-erosion printers in which the surface of the lacquer (3) and consequently also the surface of the superimposed aluminum layer (5) show a multitude of shallow dimples (6) in the .mu. range which are very small compared with the front surfaces of the print electrodes, which are of maximum uniformity, and whose spacing is equally in the .mu. range.

Abstract: Disclosed is a self-aligned process for providing an improved bipolar transistor structure.The process includes the chemically etching of an intermediate insulating layer to undercut another top layer of a different insulating material in a self-aligned emitter process wherein the spacing of the emitter contact to the polysilicon base contact is reduced to a magnitude of approximately 0.2 to 0.3 micrometers. In addition, in the process an emitter plug is formed to block the emitter region from the heavy P+ ion dose implant of the extrinsic base.

Abstract: A randomly accessible memory display is disclosed wherein a latching memory panel can be placed in direct optical contact with the triggering electroluminescent panel having a similar matrix. Once the glowing light from the trigger panel shines on the photosensitive resistive layer providing positive feedback, the corresponding region in the latching memory panel is latched. In accordance with the invention, a technique is disclosed for electrically reading the latched state in any one cell. This is done by selectively propagating a high frequency sinusoidal interrogation signal through each of the Y axis lines connected to the cells and measuring any phase alteration in each of the X axis lines connected to the cells, for each Y axis line interrogated. Since the resistance of the photosensitive resistor for a particular latching cell is altered if that cell is emitting light, the impedance of the cell is changed, thereby introducing a phase shift to the interrogation signal.

Abstract: In superconductive circuitry including a superconducting ground plane, a magnetic flux trapping moat is provided which surrounds a superconductive device. The moat is preferably a cut through the superconducting ground plane which extends along a perimeter surrounding the superconducting device, the moat being continuous except for small regions where there is no cut. The small regions serve as current carrying portions to link the ground plane within the moat to the rest of the ground plane outside of the moat. The moat is a flux pinning center so that magnetic flux does not enter the ground plane region located near the superconducting device. In a Josephson circuit, the Josephson tunnel devices are especially sensitive to trapped magnetic flux in the ground plane, and the provision of a moat around each of the devices prevents flux from moving into the ground plane areas near the devices and becoming trapped therein.

Abstract: A test circuit that is particularly suitable for inclusion on an LSI chip when testing a new technology. The circuit will enable accurate determination of the turn-on and turn-off delays of a logic circuit on the chip. Two related feedback loops are provided, one of the loops containing the circuit being tested. The differences in time duration between related portions of the two loops correspond to the turn-on and turn-off delays of the circuit being tested.

Abstract: A circuit arrangement is provided for the continual operation monitoring and error diagnosis of a stepper motor controllable at its windings by control logic and driver stages using stepping pulses which are phase-shifted relative to each other. A multi-stage ring counter is used for logically representing the desired values of the stepping pulses with the ring counter under control of the stepping control pulses applied to the input of the control logic stage. A multi-stage compare circuit arrangement is used to compare the logical values of the stepping pulses from the ring counter with the logical values of the output signals from both the control logic stage and driver stage.

Abstract: In vacuum sputter cleaning and plating operations forming a patterned metallic layer on a silicon semiconductor chip, alignment is maintained by anticipating the difference in thermal expansion between the molybdenum mask and the silicon chip and forming the apertures in the molybdenum mask in a radially offset position with respect to the intended cleaning and deposition locations on the semiconductor chip, when the mask and the chip are at room temperature. Then, when the mask and the silicon chip are maintained in a concentric position and are raised to the cleaning and deposition temperature, the differential expansion of the molybdenum mask will bring the apertures therein into perfect alignment with the intended deposition locations on the silicon wafer.

Abstract: A saturation-limited bipolar transistor device or circuit and a method of making same are provided which includes a merged NPN transistor and a PNP transistor structure formed so as to produce denser cells or circuits. A simple process is used to form the structure which includes a double diffused technique for making the PNP transistor. The PNP transistor has a double diffused emitter-base arrangement wherein the emitter is asymmetrically positioned with respect to the base so as to also serve as a contact for the base of the NPN transistor. The PNP transistor limits the input current by bypassing excess current to a silicon semiconductor substrate or chip. The structure includes an N type epitaxial layer formed on an N type subcollector with a P type region provided near the surface of the epitaxial layer. The epitaxial layer serves as the NPN collector and as the PNP base contact region.

Abstract: A laser printer having a gallium arsenide laser and a photoconductor sensitive to the output wave energy of such a laser, the photoconductor having ordered layering of (1) a polycarbonate polymer adhesive layer coated onto an electrically conductive substrate, (2) a first CDB or TMB containing charge generating layer, (3) a second OHSQ containing charge generating layer, and (4) a top-located charge transport layer.

Abstract: Apparatus for carrying out in situ chemical analysis of biological fluids is disclosed. A test package adapted for use with spinning rotor includes a sample-compartment, an integral cuvette and compartments for prepackaged reagents. The latter are adapted to be introduced via breakable seals into the sample compartment which contains the sample to be analyzed. The sample and reagents are then introduced via another breakable seal into a cuvette. Under pneumatic and rotational forces, mixing and measuring are carried out in situ. The rotor includes a programmable pressure applying arrangement whereby the dispensing of reagents and the movement of the latter and sample into a cuvette are controlled. Optical measurements are then carried out in situ.