Abstract: Print heads are formed with spaced subheads having nozzles such that all of the lines or pixel rows on a print medium such as a sheet of paper are printed by scanning of the print head along the face of the sheet. The head structures include three subheads, each having nozzles for printing one or more adjacent lines with the subheads being spaced the same number of lines apart as the number of lines each prints; and three subheads spaced the equivalent of seven lines apart, each subhead having three nozzles spaced at the equivalent of alternate lines. The heads are advanced between scans by an equivalent number of lines generally equal to the number of nozzles in the head, whereby all print lines are addressed only once. Apparatus for printing includes the use of pointers in registers to keep track of head structure and location on a print medium for calculating print addresses. A partial page memory is used which wraps around to the beginning from the end.

Abstract: An outer wall member, such as the wall of a tube, connectable to or integral with the pipe, has an opening in communication with the exterior of the pipe. An inner member is fixedly positioned against the inside of the outer member for separating the opening from the fluid path through the pipe. The inner member has an inner surface defining at least a portion of an inner chamber in communication with the pipe fluid path. The inner and outer members define a labyrinth having an effective cross-sectional area, an inlet end for receiving pressurized fluid from the pipe, and an outlet end in communication with the pipe opening for emitting fluid. A plurality of channels couple intermediate portions of the labyrinth directly to the opening, thereby bypassing respective parts of the labyrinth.

Abstract: A simple cascode configuration of a first, common source transistor coupled to a second, "common" gate transistor is modified by the use of a third transistor conditionally coupling the "common" gate to the source of the second transistor. This coupling is made conditional by a filter network connecting the "common" gate to the source of the second transistor and to the drain of the regulating or third transistor. High pass, low pass and band pass RC network configurations are shown.

Abstract: Printing is by an array of color-printing elements or nozzles in order to produce interlaced color printing while printing each line only once with each color. Print head array configurations for printing two, three and four colors include linear and parallel arrays. In one embodiment, a first color and a second color are printed on alternate lines of a first set of print lines. The first color and a third color are printed on alternate lines of a second set of print lines. Also, the second color and the third color are printed on alternate lines of a third set of print lines. By sequentially printing these consecutive sets of lines on a print medium, with each of the three pairs of colors, all of the lines of an image are printed once with each color. Other color-printing configurations are also shown.

Abstract: A detector for generating an output signal representative of the power of an input signal comprises an input capacitor coupled to receive the input signal for transmitting alternating current portions of the input signal. A first common-source FET pair have gate terminals coupled to a temperature-compensating circuit for varying the gate-to-source voltage. The drain of one FET is coupled through an intermediate capacitor to ground. That drain is also coupled to a relatively positive voltage source through a series-connected inductor and resistor. The drain of the second FET is also coupled to the voltage source through a resistor. An output capacitor couples the alternating current signal, at the junction between the resistor associated with the first transistor and the inductor, to ground. A differential amplifier and comparator generates an output signal representative of the difference between the signals appearing on the transistor sides of the two resistors.

Abstract: A print medium sheet feeding system for an ink jet printer having a print head with a planar array of jets is provided by clamping the leading edge of a paper after it is passed through a printing zone to a rotating assembly of parallel disks. The sheet is pulled through the printing zone by rotating the disk with the clamp being carried with the rotating drum. A platen may be provided which has a flat surface in the printing zone forming a tangent to the outer surface of the rotating disks. Alternatively, the platen may be removed and the sheet held in tension between the clamp and a nip region formed by a spring plate held against a restraining plate. In an alternative embodiment, the sheet is initially clamped against the drum by the combination of a lever arm which is selectively engagable with the drum for rotation therewith and an attached actuating arm having a plate which secures a sheet to the drum surface.

Abstract: A cascode transistor configuration includes an input terminal for receiving the input signal, an output terminal for outputting the output signal and bass and emitter terminals connectable to ground. Each of a predetermined plurality of common-base heterojunction bipolar transistors (HBTs) has a base coupled to the base terminal, and a collector coupled to the support output terminal. Each of the predetermined plurality of common-emitter HBTs is associated with one of the common-base HBTs. Each common-emitter HBT also has a base coupled to the input terminal, an emitter coupled to the emitter terminal, and a collector coupled to only the emitter of the associated common-base HBT.

Abstract: Printing is by an array of color-printing elements or nozzles in order ot produce interlaced color printing while printing each line only once with each color. Print head array configurations for printing two, three and four colors include linear and parallel arrays. In one embodiment, a first color and a second color are printed on alternate lines of a first set of print lines. The first color and a third color are printed on alternate lines of a second set of print lines. Also, the second color and the third color are printed on alternate lines of a third set of print lines. By sequentially printing these consecutive sets of lines on a print medium, with each of the three pairs of colors, all of the lines of an image are printed once with each color. Other color-printing configurations are also shown.

Abstract: A computer is provided as an add-on processor for attachment to a host computer. Included are a single data bus, a 32-bit arithmetic logic unit, a data stack, a return stack, a main program memory, data registers, program memory addressing logic, micro-program memory, and a micro-instruction register. Each machine instruction contains an opcode as well as a next address field and subroutine call/return or unconditional branching information. The return address stack, memory addressing logic, program memory, and microcoded control logic are separated from the data bus to provide simultaneous data operations with program control flow processing and instruction fetching and decoding. Subroutine calls, subroutine returns, and unconditional branches are processed with a zero execution time cost. Program memory may be written as either bytes or full words without read/modify/write operations.

Abstract: A feedback circuit couples a base amplifier output to the amplifier input for feeding back a portion of an amplified input signal. The feedback circuit includes an inductor coupled in series with a variable resistance. The variable feedback resistance is provided by a feedback FET having a gate for receiving a control signal for varying the resistance between the source and drain. The gain of the base amplifier is determined over the predetermined frequency range by the combined impedance of the inductor and resistance. The base amplifier is a field-effect transistor (FET). The feedback inductance is taken from a portion of a coil coupling the drain of the base FET with an output terminal.

Abstract: Input power is applied to an input inductor/capacitor combination. The gates of each of two FETs are connected to the other side of the input inductor. The source of each FET is connected to ground potential. The drain of the first FET is connected to a first output port, and the drain of the second FET is connected to a second output port. A signal input on the drain of one of the FETs is 180.degree. out of phase with the same signal passing through the two FETs to the drain of the other FET. The gate and drain of the first and second FETs have series-connected resistance/inductance feedback networks to give input and output match. A series-connected isolation resistor and inductor are connected between the first and second output ports for feeding signals of reduced amplitude to offset signal feedback through the FETs.

Abstract: A microwave-frequency feedback amplifier circuit has a cascode amplifier with a first field-effect transistor (FET) having a gate for receiving a signal to be amplified, a source coupled to a reference voltage, and a drain. A second FET has a source coupled to the drain of the first FET, a source coupled to the reference voltage, and a drain. A transformer includes a first inductor with a first terminal coupled to the drain of the second FET and a second terminal for outputting an amplified input signal. A second inductor has a first terminal coupled to the second terminal of the first inductor, and a second terminal coupled to the reference voltage. A feedback circuit couples the drain of the second FET to the gate of the first FET.

Abstract: A bait line is secured to a main line above a sinker attached to the end of a main line during fishing by a rod having a cylindrical outer surface and opposite tapered ends. A main line bore extends from each rod end through the rod and out through a bore side opening in the cylindrical outer surface opposite from the other bore side opening. Each main line bore allows substantially unrestrained passage of the main line. Each bore side opening is closer to the rod end through which the associated bore extends than to the other rod end so that when the main line is placed through the bores, it extends between the two bore side openings in the same general direction as the main line travels through the bores. the main line wraps around the cylindrical outer surface of the rod. An auxiliary channel extends transversely through an intermediate portion of the rod and has oppositely disposed channel side openings positioned closer to one rod end than to the other rod end.

Abstract: A switch matrix for particular use in microwave monolithic integrated circuits has FET-based switch elements with at least a combined total of two gates. Embodiments include the use of single and dual gate FETs. A preferred embodiment includes cascode-coupled FETs in series with inductances between input and output terminals. The input is taken from an artificial transmission line formed of a plurality of series-coupled inductors or from the junctions of series-coupled pairs of mutually coupled inductors.

Abstract: A computer is provided as an add-on board for attachment to a host computer. Included are a single data bus, a 16-bit arithmetic logic unit, a data stack, a return stack, a main program memory, data registers, program counters, microprocessor memory, and microinstruction register. Each stack has a pointer which may be set without altering the contents of the respective stacks. The main program memory has a direct connection to the writable microprogram memory for providing instruction. MVP-FORTH is used for programming a microcode assembler, a cross-compiler, a set of diagnostic programs, and microcode.

Abstract: Print heads are formed with spaced subheads having nozzles such that all of the lines or pixel rows on a print medium such as a sheet of paper are printed by scanning of the print head along the face of the sheet. The head structures include three subheads, each having nozzles for printing one or more adjacent lines with the subheads being spaced the same number of lines apart as the number of lines each prints; and three subheads spaced the equivalent of seven lines apart, each subhead having three nozzles spaced at the equivalent of alternate lines. The heads are advanced between scans by an equivalent number of lines generally equal to the number of nozzles in the head, whereby all print lines are addressed only once. Apparatus for printing includes the use of pointers in registers to keep track of head structure and location on a print medium for calculating print addresses. A partial page memory is used which wraps around to the beginning from the end.

Abstract: A monolithic microwave integrated circuit (MMIC) phase shifter is implemented in push-pull configuration with the quadrant selection and vector modulation functions combined. These functions are provided by four sets of adjustable gate-width dual-gate FETs and a pair of lumped element filter networks with a relative differential phase shift of 90.degree..

Abstract: An ink jet print head face cleaner provides a controlled air passageway through an enclosure formed against the print face. Air is directed through an inlet into a cavity in a body. The body has a face with an opening into the cavity. This face is sealingly placeable against the print face. The cavity has a limited size so that air is directed without interruption through the cavity past the ink jet apertures, and out an outlet. The cleaner body is coupled resiliently to a platform to allow positioning of the body and print faces flush with each other. A vacuum source is preferably attached to the outlet to create a subatmospheric pressure in the cavity to further seal the two faces together. A collection chamber and removable drawer are positioned below the outlet to facilitate disposing of removed ink.

Abstract: A hip reciprocating apparatus of a reciprocating gait brace provides for transfer of forces from movement of one leg to a reverse movement of the other leg of a user. A C-shaped pivot member pivots about a horizontal axis and is mounted at the back of the pelvic band of a gait brace. The pivot member ends are adjacent hip joints which couple the pelvic band to a leg or lower hip joint member. A length-adjustable tie rod couples the pivot member ends to posteriorly extending protrusions of the associated leg member. The pivot point of the pivot member may be equally or unequally spaced relative to the pivot member ends. The leg member protrusions may be of different lengths. A spring may be used to store energy during pivoting of the pivot member in one direction and release of the energy during pivoting in the other direction. An external power source may apply energy to movement of the pivot member in both directions.

Abstract: An apparatus providing a substantially fixed length cable drive comprises a motor-driven capstan having a helical groove. The groove on the capstan is sized to receive opposite ends of a cable for simultaneously letting out and taking up the cable. The cable passes over a fixed pulley and is attached to a carriage at a point intermediate the capstan and pulley. The carriage is guided along a rail defining a fixed mass path. The section of cable between the carriage and pulley is parallel to the mass path. The cable ends on the capstan are disposed on opposite sides of a plane containing the parallel cable section during travel of the carriage along the mass path.