Did You Know...
...Chester Carlson was a patent agent who tired of having to make multiple copies of patent applications using the only duplication method available at the time: carbon paper. In 1959 he came up with a new copying system and took it to IBM for evaluation. The "experts" at IBM determined potential sales to be only 5,000 units because people wouldn't want to use a bulky machine when they had carbon paper. Carlson's invention was the xerography process, the company founded on the system is Xerox.
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| Number | Title | Issue Date |
| 4344905 | Gas lasers A cathode electrode for a gas discharge laser comprises a block of platinum black compressed into a solid mass.... | 08/17/1982 |
| 4336528 | Semiconductor resistive network A network of different weighted resistances, for example, binary resistances, coupled in parallel with each other, is provided in a semiconductor body by providing a plurality of substantially identical resistors, with different numbers of the identical r... | 06/22/1982 |
| 4257660 | Electric connector having a plurality of in-line contacts An electric connector comprises a housing (10) having a base (11) and two side walls (12, 13) together defining a longitudinal slot (14) into which a plug member may be inserted. A plurality of projecting walls (15) define a number of transverse openings ... | 03/24/1981 |
| 4237537 | Price display setting arrangements A unit price setting arrangement for differently priced products available from a remotely located dispenser for example, grades of fuel, from a pump, consists of a central transmitter and a receiver in each dispenser. The transmitter forms a series of fi... | 12/02/1980 |
| 4225865 | Gain-controlled amplifier circuits Apparatus for controlling the gains of a pair of gain-matched amplifiers includes means for applying a pilot tone of constant amplitude to each amplifier through separate attenuators during a repeated correction time interval. Three control loops are prov... | 09/30/1980 |
| 4224545 | Speed control A speed control arrangement for a rotatable member driven by an energy source, such as a spring, whose driving torque can vary consists of an eddy current brake comprising an eddy current rotor driven with the rotatable member and a magnetic circuit coupl... | 09/23/1980 |
| 4223335 | Semiconductor device body having identical isolated composite resistor regions A resistor comprises two identical resistor regions with each resistor region isolated within the semiconductor body by a P-N junction, and with one electrode-bearing end of each resistor region both connected together and to a common region surrounding t... | 09/16/1980 |
| 4219780 | Gain controlled amplifier circuits Apparatus for controlling the gains of a pair of gain-matched amplifiers includes means for applying to each amplifier a pilot tone in the form of an exponentially-decaying periodic signal. The apparatus also includes three control loops, one for comparin... | 08/26/1980 |
| 4217787 | Gyroscopic apparatus A free rotor gyroscope has a gimbal supported for limited rotation about a rotatable shaft by a first flexure suspension and a rotor attached to the gimbal by a second flexure suspension. Pickoff means rotate with the gimbal and detect its movements about... | 08/19/1980 |
| 4210838 | Gas discharge display panel In a gas discharge display panel consisting of a matrix of discharge cells defined by gas filled cavities in a block and having cathodes formed by sets of conductors on an end plate sealing the cavities and in which the matrix includes priming cells which... | 07/01/1980 |
| 4201432 | Electric connectors An electric connector for interconnecting two printed circuit boards comprises a socket member for attachment to one board and a plug member for attachment to the other board. The socket member contains a number of rows of rigid contact members, while the... | 05/06/1980 |
| 4201898 | Inertia switches An inertia switch comprises a spiral spring-like member supported by a post in a housing, the spring comprising one contact of the switch and the housing the other. The post is insulated from the housing and provides a terminal for the switch. Acceleratio... | 05/06/1980 |
| 4196419 | Analog to digital converter A circuit for digitizing data represented by a variable electric current includes a capacitor to which a variable direct current is applied, and a reference stage defining two voltage levels and producing a control signal when the voltage across the capac... | 04/01/1980 |
| 4193017 | Gas discharge display panel A d.c. gas discharge display panel consists of a rectangular array of discharge cells suitable for displaying alphanumeric characters surrounded by a circular array. The two arrays share one common set of conductors and are addressed sequentially by reduc... | 03/11/1980 |
| 4185230 | Gas discharge display panel having an array of discharge cavities and a self scan glow transfer device formed by cavities in the array A gas discharge display panel has a glow transfer device extending along one or both edges of the panel and consisting of a row, or rows, of cavities extra to the display. One electrode of the, or each, transfer device is common to the conductor associate... | 01/22/1980 |
| 4181863 | Photodiode circuit arrangements Temperature regulation of an avalanche photodiode is obtained by internal heating, by passing a reverse current through the breakdown region of the photodiode. In operation, an empirically-derived, reverse bias potential, equal to the breakdown potential ... | 01/01/1980 |
| 4172666 | Inspection apparatus To distinguish between different types of fault detected by laser scanning of a moving web two or more detectors are arranged to collect light reflected in different ranges of angles in direction of web motion. By combining outputs of these in a logical w... | 10/30/1979 |
| 4161742 | Semiconductor devices with matched resistor portions In an integrated circuit semiconductor device different matched resistors are provided by at least one resistor comprising at least two matched resistor parts connected together, these resistor parts also being matched to each constituent resistor part of... | 07/17/1979 |
| 4160990 | Semiconductor devices and circuit arrangements including such devices A circuit arrangement at least partially embodied in a collector-diffusion-isolation (CDI) type device, in a semiconductor body comprising a thin layer initially wholly of one conductivity type on a substrate of the same conductivity type, has at least on... | 07/10/1979 |
| 4160455 | Heater for heating fluid in a body cavity A heater for heating fluid within a body cavity of an animal say for heating tumours by irrigation, comprises a container having inlet and outlet ports through which fluid in the cavity is passed by an external pump, and a heating element in the container... | 07/10/1979 |
| 4156856 | Gas lasers with platinum black cathode A gas discharge laser has a cathode electrode comprising a block of platinum black compressed into a solid mass.... | 05/29/1979 |
| 4155012 | Discrimination circuit arrangements A discrimination circuit operable to discriminate between an input signal in the form of a pedestal and disturbance signals superimposed thereon has an A-D converter to digitize a disturbance-free reference pedestal signal, circulating shift register to s... | 05/15/1979 |
| 4152942 | Inertial platforms An inertial platform having four gimbals, an intermediate one of which is capable of only limited movement, has pickoffs and torque motors on each gimbal axis. Part of the intermediate gimbal and an adjacent gimbal are removable, these parts being joined ... | 05/08/1979 |
| 4150767 | Liquid blending and dispensing apparatus Liquid dispensing apparatus for dispensing a blend of first and second liquids has flowmeters operable to measure the quantity of each liquid delivered. The flowmeter outputs are multiplied by a factor equal to the proportion of one liquid in the blend an... | 04/24/1979 |
| 4149417 | Distance measuring arrangements A distance measuring arrangement has an accelerometer transducer of the force balance type in which a switch closed by the action of an acceleration force causes a constant current to flow in a coil to oppose the force and open the switch. The switch open... | 04/17/1979 |
| 4145621 | Transistor logic circuits A transistor logic circuit includes a constant current source in the form of a current mirroring arrangement connected to a logical gating combination of switching transistors, the arrangement being such that the switching transistors do not saturate.... | 03/20/1979 |
| 4139307 | Surface inspection systems A surface inspection system has a light beam repetitively scanning a surface and a receiver located to receive light specularly (directly) reflected. The receiver has an enclosure with a wall containing a plurality of slits by which reflected light can re... | 02/13/1979 |
| 4134124 | Semiconductor devices and circuit arrangements including such devices A circuit arrangement is at least partially embodied in a collector-diffusion-isolation (CDI) type device, in a semiconductor body comprising a thin layer initially wholly of one conductivity type on a substrate of the same conductivity type, and the devi... | 01/09/1979 |
| 4130880 | Data storage system for addressing data stored in adjacent word locations An information retrieval system is described comprising a store having a plurality of word locations, each of M bits for receiving and storing an item of digital data, e.g. an operand of N bits greater than M, a store address circuit for addressing simult... | 12/19/1978 |
| 4121293 | Indication means for indicating suitable conditions for the transfer of loads between two stations movable relative to each other in a vertical plane For use with apparatus for transferring a load between two stations movable relative to each other in a vertical plane by means of a crane carried by one of the two stations having a hook assembly for attachment to the load on the other station for liftin... | 10/17/1978 |
| 4118109 | Optical apparatus for controlling the direction of a beam of optical radiation Apparatus for controlling the direction of a beam of optical radiation from, say, a laser, includes two prisms of small apex angle independently rotatable about a common axis. A control circuit is responsive to the actual angular positions of the prisms a... | 10/03/1978 |
| 4118012 | Load transfer Control of vertical motion of a suspended crane hook assembly to accommodate vertical motion between a station carrying the crane and a station carrying a load is achieved by a transducer on the hook assembly and a control cord depending onto the load sta... | 10/03/1978 |
| 4115008 | Displacement measuring apparatus Apparatus for measuring the extent and sense of relative movement between two objects comprises a reflecting ruled grating carried on one body and optical reading head carried on the other. The reading head includes a light source arranged to produce at l... | 09/19/1978 |
| 4112487 | Apparatus for writing data in unique order into and retrieving same from memory Data processing apparatus includes a storage circuit or memory, and an addressing circuit for identifying word locations within the storage circuit into and from which a plurality of information items are to be written and read, respectively. Further, the... | 09/05/1978 |
| 4106051 | Semiconductor devices A semiconductor device having an ohmic contact including a metal layer of molybdenum or tungsten on a first polycrystalline silicon layer, is provided with a second polycrystalline silicon layer on the metal layer, to prevent the subsequent oxidation of t... | 08/08/1978 |
| 4096425 | Servo systems A servo control system comprising, in a feedback loop, means for providing an error signal representing the difference between desired and actual conditions of a controlled system, and means responsive to said error signal to produce a control signal for ... | 06/20/1978 |
| 4086569 | Communication systems A communication system for communicating between a central control unit and a plurality of controlled units, all interconnected by a single communication channel, wherein communication is time multiplexed with control words being transmitted in each direc... | 04/25/1978 |
| 4083308 | Projectile fuzes A projectile fuze contains a radio receiver, an oscillator, a counter and detonation means activated by an output signal from the counter. After firing the oscillator is started for a unit time period defined by successive signals transmitted to the proje... | 04/11/1978 |
| 4079509 | Method of manufacturing semi-conductor devices Semiconductor devices are mounted on corresponding lead frames by being inserted into apertures of a masking member in a desired registration with the lead frame strip.... | 03/21/1978 |
| 4079252 | Photoelectric grating displacement measuring apparatus A measuring system includes a scale grating carried on one of two relatively movable bodies and an index grating carried on the other. The scale grating is illuminated directly in such a way that light passing from it to the index grating is at least part... | 03/14/1978 |
