Did You Know...
...that the x-ray was discovered purely by accident? When German physicist Wilhelm Konrad von Roentgen was experimenting with cathode rays in 1895, he put an activated Crookes tube in a book and went out to lunch. When he returned, he discovered that a key that had also been placed in the book showed up as an image on the developed film!
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| Number | Title | Issue Date |
| 4389876 | Temperature sensor and detector cell utilizing the same A temperature sensor uses a thin film structure having an RF sputtered layer of a temperature sensitive material forming a thermistor element deposited on an electrically insulating and thermally insulating substrate. The sensor may include a plurality of... | 06/28/1983 |
| 4386397 | Method and apparatus for process control A method and apparatus for process control of batch processes utilizing the steps of storing in a memory the actual measured values of the process variable and utilizing the memorized values for an estimative operation to determine the timing for supplyin... | 05/31/1983 |
| 4382698 | Combustible gas analyzer A combustible gas analyzer for determining the Wobbe Index of a combustible gas uses a constant pressure combustible gas supply and constant flow rate air supply to provide oxygen and gas for combustion. The air is supplied directly to be mixed with the c... | 05/10/1983 |
| 4382268 | Tape transport speed control A tape transport speed control uses a speed controller supplied with packing density or digital bits per inch of recording medium and data rate or digital bits per second to compute the speed of the tape which would conform to these selected parameters by... | 05/03/1983 |
| 4371901 | Programmable signal equalizer A programmable signal equalizer uses a plurality of active RC circuits arranged to be controlled by a ladder resistor network. The resistor ladder circuits are selected by digital word signals representative of the selected magnetic tape speed to produce ... | 02/01/1983 |
| 4370018 | Universal terminal block connector A terminal block connector uses a first nut having an internal thread of a first diameter and type and a second nut coaxially arranged therewith having an internal thread of a second diameter and type. To further the universality of the connector, the fir... | 01/25/1983 |
| 4344632 | Fluid pressure sealing ring for a valve A butterfly valve having a valve body and a valve disc which is rotated to produce an engagement with a peripheral edge of the disc and an annular seat or wall defined by a portion of an internal fluid passage in the valve body uses a seal ring member mou... | 08/17/1982 |
| 4344159 | Ultrasonic transducer An ultrasonic signal transducer is characterized in that the piezoelectrically active element has a first unitary electrode over the entire surface of one face and a matrix of a plurality of individual electrodes on the opposite face. In the receive mode,... | 08/10/1982 |
| 4343007 | Multi-color multi-point recorder A multi-point recorder has a multi-color ink cartridge arranged to be selectively aligned with a recording head having a plurality of selectively energizable recording elements whereby a color from the multi-color ink cartridge is selected for printing by... | 08/03/1982 |
| 4343010 | Recorder control circuit for suppressing incipient arcing at the heating electrodes In an improved control circuit for the heating current of a system for developing latent photographic images on a heat developable medium, an incipient loss of tension in the record medium is sensed by detecting high frequency components of the energizing... | 08/03/1982 |
| 4333115 | Tape transport control system A tape transport control system for monitoring the amount of tape on a tape reel using a first transducer means to provide a signal representative of the rotational speed of the tape reel. A fixed frequency oscillator is arranged to provide signals to be ... | 06/01/1982 |
| 4329873 | Calorimetric apparatus A calorimetric apparatus for determining the calorific content of a fuel gas uses a reactor for producing oxidation of the fuel gas and a combustion gas in the presence of a catalytic oxidizer. The oxidizer is heated by a constant current supply to a cata... | 05/18/1982 |
| 4329877 | Adjustable overload mechanism for a differential pressure transmitter An adjustable overload mechanism for a differential fluid pressure transmitter includes a first and a second overload control diaphragm and an adjustable spring pressure means for applying an adjustable preload pressure to the control diaphragms. The spri... | 05/18/1982 |
| 4329874 | Calorimetric apparatus A calorimetric apparatus for determining the calorific content of a fuel gas uses a reactor for producing oxidation of the fuel gas and a combustion gas in the presence of a catalytic oxidizer. The catalytic oxidizer is mounted on one end of a thermo-elec... | 05/18/1982 |
| 4320165 | Thick film resistor A unitary thick film resistor structure includes a first thick film resistor element formed on one face of a substrate and a second thick film resistor element formed on the opposite face of the substrate. The resistor elements are of complementary, subst... | 03/16/1982 |
| 4320450 | Protection apparatus for multiple processor systems In a data protection apparatus for a multiple CPU system having a common or multiported bulk memory, an interface structure is associated with each of the CPU's. The interface structure cooperates with a firmware engine which is, in turn, a part of the in... | 03/16/1982 |
| 4319343 | Programmable digital memory circuit A programmable digital memory circuit uses a programmable read only memory (PROM) to correct code errors and permit expansion to additional PROM chips. Each code correction or expansion is made via enabling a portion of an overlay patch programmable read ... | 03/09/1982 |
| 4317201 | Error detecting and correcting RAM assembly A RAM assembly, or card, includes a random access memory portion for the data bits, as well as a random access memory portion for corresponding check bits. The card includes a parity generator and a parity comparator to determine the presence of an error.... | 02/23/1982 |
| 4316198 | Electrographic recording An electrographic recording system includes means wherein toner powder having electrical and magnetic properties is carried from a hopper to a recording station by a rotatable drum or shell. The shell is rotated about a magnetic core structure which produ... | 02/16/1982 |
| 4315430 | Gas calorific content analyzing apparatus A gas analyzing apparatus for determining the BTU or calorific content of a combustible gas uses a radiometer or optical pyrometer for measuring the temperature of a metal cup black body heated by a flame produced by a combustion of the combustible gas in... | 02/16/1982 |
| 4316082 | Computer control apparatus A computer interface console includes a cathode ray tube display, an operators keyboard, and an engineers keyboard. The engineers keyboard is so mounted that it may be moved to a position in front of the console in substantial alignment with the cathode r... | 02/16/1982 |
| 4307617 | Indicating and control apparatus utilizing Hall effect elements An indicating and control apparatus uses Hall effect elements arranged on one side of a non-magnetic wall separating the elements from selectively positionable respective magnets. The magnets are selectively positioned adjacent to the non-magnetic wall to... | 12/29/1981 |
| 4306451 | Gas analyzer A gas analyzer for determining the BTU or caloric content of a combustible gas uses a temperature measuring device for measuring the temperature of a metal cup which is heated by a flame produced by the combustion of the gas in an excess air environment. ... | 12/22/1981 |
| 4303984 | Sensor output correction circuit A sensor correction circuit uses a programmable read only memory (PROM) for storing characterizing information for an associated sensor or transducer. The information is stored in the 1×2048 bit configuration. The programmable read-only memory (PROM) has... | 12/01/1981 |
| 4300062 | Offset compensation circuit for charge-coupled devices A circuit for removing the DC or background representing charge component of a signal to be retrieved from a charge-coupled device to individually compensate for variations of each charge-coupled device circuit. A threshold gate is interposed in a charge ... | 11/10/1981 |
| 4296464 | Process control system with local microprocessor control means In a computer control system a central processor unit (CPU) is provided as a primary control center. A data bus interface controller is connected to interface between the CPU and a serial data communication bus. The interface control unit controls the tra... | 10/20/1981 |
| 4296445 | Phase sensor In a magnetic tape recording/playback system, there has here been provided a phase sensor circuit wherein a recorded square wave signal, when played back, produces a signal which includes a predominant first and third harmonic. A filtered sample of the re... | 10/20/1981 |
| 4285779 | Method of making a fluid circuit device A fluid circuit device provided with a fluid circuit formed by a base member and a thin sheet integrally electrocast on said base member and methods for producing the fluid circuit device with parallel and non-parallel fluid circuits.... | 08/25/1981 |
| 4286234 | Multivibrator circuit A multivibrator circuit having a pair of capacitor cross-coupled transistors arranged to form a flip-flop circuit. The base and collector currents for the flipflop transistors are concurrently varied by respective current sources controlled by a multivibr... | 08/25/1981 |
| 4285244 | Non-symmetrical overload protection device for differential pressure transmitter A differential pressure to electrical signal transmitter has a pair of barrier diaphragms and a central control diaphragm located between the barrier diaphragms. Input fluids are applied to respective chambers on the outside of the barrier diaphragms whil... | 08/25/1981 |
| 4282428 | Chromosome detector using a scanning microscope system A chromosome detector using a scanning microscope system is used to detect the presence of a chromosome spread in a slide specimen and to produce a signal usable by the scanning microscope system to automatically operate the microscope system whereby the ... | 08/04/1981 |
| 4280823 | Method and apparatus for sonic separation and analysis of components of a fluid mixture An apparatus and method for separating components of a fluid mixture of materials uses an acoustic or sonic generator attached to one end of a hollow tube, or column having a uniform internal diameter, to produce standing sonic waves within the column. Th... | 07/28/1981 |
| 4281299 | Signal isolator A signal isolator has an acoustic transmitting medium with a first pair of acoustic transducers thereon for transmitting an input signal through the medium at a first frequency. A first transmitting and receiving circuit is used in combination with the fi... | 07/28/1981 |
| 4280889 | Solid state ion responsive and reference electrodes A solid state ion concentration measuring electrode having the ion concentration measuring electrode structure formed by successive layers on an insulating substrate with an outer ion sensitive glass layer being deposited on a substantially thermally matc... | 07/28/1981 |
| 4278195 | Method for low temperature bonding of silicon and silicon on sapphire and spinel to nickel and nickel steel and apparatus using such _a bonding technique A method for low temperature bonding of silicon and silicon on sapphire and spinel to nickel and nickel steel using a layered structure with an aluminum interface between the nickel or nickel steel and the silicon. The bonding is achieved in a reducing at... | 07/14/1981 |
| 4276913 | Method and apparatus for fluid sample injection for fluid chromatography A method and apparatus for fluid sample injection for a chromatograph using an acoustic or sonic generator generating standing waves in a hollow tube. A selectively controlled source of a carrier fluid is arranged to apply a carrier fluid to one end of th... | 07/07/1981 |
| 4269071 | Electrodes for an electromagnetic flow meter Electrodes for an electromagnetic flow meter are mounted through a pipe wall using pairs of concentric electrodes electrically insulated from each other and from the mounting pipeline while electrically contacting a fluid in the pipeline being measured fo... | 05/26/1981 |
| 4267434 | Method of and apparatus for heat processing photosensitive material In the method and apparatus disclosed herein, heat processing pulsing current is passed, on command, through the conductive backing of an exposed record sheet of heat-processable photosensitive material. The sheet resistance is included as one arm of a br... | 05/12/1981 |
| 4267276 | Medical specimen culture bottle A micro-organism culture bottle is molded of a high strength, high transparency, high temperature plastic which exhibits low permeability to oxygen and carbon dioxide and which is chemically inert to the substances intended to be used therewith. The neck ... | 05/12/1981 |
| 4264893 | Data communication system A data communication system having a pair of data signal carrying conductors with each conductor providing an independent data link between a central station and a remote, or field, station. The data signal carrying conductors are each routed over a separ... | 04/28/1981 |
