Abstract: Method and device for detecting the presence or the absence of conductive indicia carried by a supporting substrate which together comprise a security document, for the purpose of ascertaining the genuineness, value or other selected characteristic represented by said indicia. The indicia material is electrically conductive. The detecting device includes a housing and a sensing circuit including a source of high frequency a.c. alternating signals, first and second electrodes and the a.c. source coupled thereto.A carrier for the document is arranged in proximity to said electrodes. The questioned document is placed in the vicinity of the electrodes whereby the presence of the conductive encoding indicia serves as a coupling mechanism between the electrodes for capacitively inducing a secondary a.c. signal from the first electrodes to the second which is different from the first mentioned a.c. signal, said secondary signal being of a selected measured magnitude representative of said presence and of encoding.

Abstract: A pseudorandom binary sequence generator employing a conditional feedback path between several individual outputs and the input of a clocked shift register. Enhanced reistance to a latchup condition is brought about by way of a delay of one of the outputs, relative to the other outputs, as coupled to the feedback path.

Abstract: Logic controlled regulated power supply which produces a d.c. output potential which is stabilized at a predetermined value through the variation of the average efficaciousness of a train of rectified clock pulses. The level where the predetermined value is satisfied is sensed to produce a logic level which inhibits further clock pulse efficacy at least until such time as the d.c. output potential, as accumulated across a charge holding capacitor, dissipates to a level less than the predetermined value through the impedance of an external load whereupon the flow of clock pulses are resumed for at least the period of time necessary to integratively reaccumulate sufficient rectified charge in the charge holding capacitor to again exceed the predetermined value. This cycle of enablement and disablement of clock pulse flow continues ad infinitum thereby maintaining a relatively constant d.c. level across the terminals of the charge holding capacitor.

Abstract: A two terminal timed electric switch which connects in series with but one side of a power carrying a.c. circuit. In particular the timer serves as an effective replacement for the ubiquitous wall-switch type of on and off device used in the construction trades, as in houses, business buildings, and the like. An advantage is that when used as a replacement for an ordinary switch, the timer serves to achieve significant energy savings by turning forgotten lights off when not needed. The timer functions as a delayed-off switch; that is to say the switch and the load are turned on by manual actuation, but turn-off does not occur until some finite time period has elapsed. The timed switch employs all electronic timing elements, e.g. no motors or thermal timing elements or the like.

Abstract: A power supply which serves as a power converter from a relatively low primary direct current energy source, to a generally higher value of secondary direct current power for application to an electric load element. The secondary power is voltage regulated. Regulation is provided by limiting the number of electric pulses of primary power produced by the converter to not more than the least total number of such pulses necessary to maintain the secondary voltage at its preferred average d.c. voltage level.

Abstract: In an electrophotographic image forming process, a method and apparatus for providing an electric toning bias wherein the instantaneous electric potential value of the bias is changed with time in proportion to the natural decay of the resident electric charge inherent in the photoconductor comprising the essence of the electrophotographic medium.

Abstract: A sequential corona charging method including apparatus therefor which acts to provide several corona fields, each of its own distinct origin, which are brought together with some spatial overlap to act collectively to provide uniform charge current distribution throughout the surface of an electrophotographic medium. Independence from non-uniform charging brought about by the undesirable effects of electrostatic repulsion between adjacent electric corona fields is achieved through the rapid controlled on and off sequencing of overlapping field corona regions so that the active time coincident therebetween is negligible.

Abstract: Indicia sensor apparatus which provides for a ready, low cost, electrical sensing of an indicia, supported on a readily interchangeable membrane, and provided as a coded pattern of aperture through the membrane. An elastomer electrode element, such as a conductive foam rubber, is pressed against the face of the membrane with sufficient pressure so as to induce a protuberance of some part of the relatively adaptive elastomer through each membrane aperture. This protuberance brings about contactual intercourse with a correspondent receptor electrode for each aperture position. The result is an electrical circuit change which may be utilized in a current seeking path to produce different binary logic values in accord with the coded aperture pattern carried by the membrane.

Abstract: A multilevel power assisted steering system for vehicular application providing more than one value of steering assist to the operator thereof, the purpose fow which is intended to provide better operating safety and economy. A first, or greater, value of operator assist is provided for low speed maneuvering situations, or when steering a nearly stationary vehicle such as when parking. A second, or lesser, value of assist is provided as the vehicle speed rate is purposefully increased by the operator thereby coacting to overcome at least in part any reduction in vehicle handling performance which may be brought about by such power steering assistance. In particular, the intent is to enhance the "road feel" vital to the secure handling of motor vehicles, in particular automobiles, at the higher road speeds.

Abstract: Direct Current power supply for providing a relatively low stabilized d.c. voltage from a relatively high a.c. voltage primary power source without the use of a transformer. The d.c. value is developed across a variable impedance device coupled substantially in series with the current path established between the source of a.c. power and a functional load coupled to the source of a.c. power. Through effective control of the variable impedance so as to be at a minimum value, e.g. low impedance, through one half-cycle of the a.c.

Abstract: Apparatus for radio frequency sputtering in the megahertz range, primarily higher than about six megahertz, in which the target and anode electrodes are at a low input impedance reactively such that the transfer of power to the target for practical sputtering is normally difficult. The useful plasma which provides the sputtering action has an effective high impedance which obtains between the electrodes during the sputtering process, this high impedance being shunted by a capacitive reactance made up of parasitic paths and similar capacitive components.A string of at least three resonant networks is arranged between the high frequency r.f. source and the sputtering electrodes and these networks transform impedance and voltage from one end of the string at the source to different values and conditions at the other end of the string where they are tied to the electrodes in order to achieve a maximum of overall power transfer efficiency.

Abstract: A power transfer network for efficiently coupling a source of high frequency energy to a physically large dimensioned electrode system in a sputtering machine which exhibits high spray capacitance to ground. The network includes an inductive element capable of being tapped along its length such as a linear line section and a tuning capacitor with the source of high frequency energy in the megahertz range, each of the source and the electrode system being connectively tapped into a suitable location along the inductive element.

Abstract: My invention relates to improved means for a concealed structure detector apparatus, and more particularly, to a portable device producing a polyindicative, usually biphonic, sensory response capable of providing the operator with an indication of the relative direction of lay for a covert structurement. The detector responds to pulse pattern modulated electromagnetic field signals established in the concealment object by a separate acting efficacious exciter means. The detector includes at least two inducers which are axilly offset and thereby effective to independently respond to variation in the electromagnetic field lines emanating from the structure in proportionate accordance to the relative positions of the individual inducers with respect to the structure.

Abstract: Described is a method for utilizing a unique hand-held probe or the like, in conjunction with a responsive apparatus, as the means to establish cooperative response evaluation between an intelligent being and an evaluatory system. The method involves the emplacement of a translucent document, such as ordinary bond paper, over a field of individual light sources laid out in some predefined pattern which effects correspondence between the sources and indicia which is usually included on the document obverse surface. The copulative probe is positioned, usually by the being's hand, so as to receive some part of the light rays which permeate the paper and to convert the energy into a pattern of electrical signals which tell-tale which particular light element in the field of sources has been selected. The light rays which diffuse through the document also act to provide visible energy which can be perceived by the being to help guide the probe placement for strongest signal response.

Abstract: A directional concealed object locator, say metal detector, employing a beat frequency oscillator and at least two search oscillators. The search oscillators each include a loop antenna which in part serves to determine the search frequency signal rate of each oscillator and functionally serves to produce an electromagnetic field of relatively large proportions from each loop antenna which is portably so orientable as to have the extended electromagnetic field lines, which emanate from each loop antenna, separately coupled to a buried, or otherwise obscured metal object and thereby produce changes in the search signal rate as the proximity therebetween is varied.

Abstract: Apparatus for detecting and providing a signal from detection indicia that is applied to a substrate such as a controlled document for the purpose of determining the character of the document, the substrate comprising individual substrate members or an elongate relatively continuous substrate member passing through the apparatus at high speed. Speeds of between 10 to 15 linear meters per second are the order of speeds which are contemplated by the invention.The detection indicia on the controlled document comprises an area or areas which are deliberately applied to the document in a manner which renders the detection indicia substantially more conductive than the substrate.

Abstract: An electric light controller which serves to connect and disconnect an electric lamp element load from a power source in such rapid-fire pseudorandom seuentiality that the electric lamp appears to the eye as an illusion simulating the fluctuant brightness variations inherent in a flickering flame produced light. The result is an improved specious effect for decorative items such as electric lanterns used for outdoor lighting, simulated burning fireplace log arrangements, decorative chandeliers, holiday lighting equipment such as Christmas tree lights, and other such devices. Further enhancement of realism of the produced effect is provided for "open fire" decorative apparatus, such as electric fireplace log arrangements, through the optional inclusion of a popping acoustical sound translator, excited by a pseudorandom audio signal, which serves to simulate the crackling sound made by a burning material.

Abstract: My invention teaches a vehicular signal apparatus, in particular a motor vehicle horn system, which has two successive loudness levels of operation. The first loudness level is a moderate level used as a brief "toot" to give a quick alert, as in pedestrian traffic or the like. The second loudness level is a commanding level used as a blast, as for example, in an emergency maneuver in heavy traffic. Operation is automatic, in the sense that a brief operator activation of the horn signal switch will result only in the activation of the moderate level horn, whereas operation of the blast horn is delayed such that continuous operator activation of the horn signal switch will cause the blast horn to blow within about a second after horn switch contact is made.

Abstract: A metal locator apparatus the preferred practice of which includes two electromagnetic field radiating inducers, which serve to act upon a metal object deposited in a covert medium from distinctly separate positions, including two separate search oscillators one of which is connected to each of the inducers thereby producing two output signals, each of which include distinctive frequency perturbations introduced by the proximal relationship of the metal object with the responsive inducer. The two signals are then each individually combined, or mixed with a common beat oscillator which action results in two output sets of sum and difference frequencies. By way of suitable filtering, the two difference frequencies come out as distinctly separate audio frequency signals the pitch of which fluctuates in direct accordance with the frequency perturbations appearing on the individual search oscillator combinative signals.

Abstract: A didactic, or teaching, apparatus upon which interrogatory documents, or test sheets, may be placed in the manner of an overlay on the face side of the machine. The interrogatory document, which contains at least one interrogative statement, or question, together with at least two alternative responses, or answers, will be visibly illuminated from behind by an arrangement of light emitting devices. The light will fall on the document from behind so as to distinctly transilluminate the document in the several areas occupied by the alternative responses. The several areas of the alternative responses are, at the same time, caused to individually cooperate with several coupling devices, wherein one separate coupling device is provided for each of the several alternative responses.