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You searched :Patents issued on Apr 28, 1981.

Check out Design Patents for Apr 28, 1981

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USRE30596

Image intensifier tube device - Apr 28, 1981

USRE30595

Article container for dispensing reagent slides - Apr 28, 1981

USRE30594

Positive identification method and structure - Apr 28, 1981

USRE30593

Multi-stranded coiled orthodontic arch wire - Apr 28, 1981

USRE30592

Large aperture extended range zoom lens - Apr 28, 1981

USRE30591

Rope pulling device - Apr 28, 1981

USRE30590

Vertically moored platform - Apr 28, 1981

USRE30589

Method of effecting fast turbine valving for improvement of power system stability - Apr 28, 1981

US4264986

Information-recording process & apparatus - Apr 28, 1981

US4264985

Continuous propagation structures - Apr 28, 1981

US4264984

High-speed multiplexing of keyboard data inputs - Apr 28, 1981

US4264983

Time-multiplexed CCD transversal filter - Apr 28, 1981

US4264982

Drive circuit for an infrared remote control transmitter - Apr 28, 1981

US4264981

Circuit arrangement for compensating the change in input capacitance at a first gate electrode of a dual-gate MOS field-effect transistor - Apr 28, 1981

US4264980

Self-oscillating converter for ultrashort wave radio receivers - Apr 28, 1981

US4264979

Display device for CB radio - Apr 28, 1981

US4264978

Device for locating audio surveillance apparatus - Apr 28, 1981

US4264977

Search type tuning system - Apr 28, 1981

US4264976

Tuning control apparatus for digital tuner - Apr 28, 1981

US4264975

Receiver for frequency modulated signals having two quadrature channels - Apr 28, 1981

US4264974

Optimized digital delta modulation compander having truncation effect error recovery - Apr 28, 1981

US4264973

Circuitry for transmitting clock information with pulse signals and for recovering such clock information - Apr 28, 1981

US4264972

Method and circuit for detecting errors in digital signals - Apr 28, 1981

US4264971

Converter devices - Apr 28, 1981

US4264970

Liquid crystal display cell for an electronic timepiece - Apr 28, 1981

US4264969

Standardized electronic watch movement - Apr 28, 1981

US4264968

Basic circuit for electronic timepieces - Apr 28, 1981

US4264967

Unit time producing system - Apr 28, 1981

US4264966

Balanced digital time displays - Apr 28, 1981

US4264965

Dummy cell structure for MIS dynamic memories - Apr 28, 1981

US4264964

Dynamic memory cell of the charge transfer type applicable in particular to a shift register - Apr 28, 1981

US4264963

Static latches for storing display segment information - Apr 28, 1981

US4264962

Small-sized electronic calculator - Apr 28, 1981

US4264961

Air flow rate measuring apparatus - Apr 28, 1981

US4264960

System for controlling power distribution to customer loads - Apr 28, 1981

US4264959

Testing procedure and circuit for the determination of frequency distortions and group delay time distortion of a test object - Apr 28, 1981

US4264958

Video processor for a spectrum analyzer - Apr 28, 1981

US4264957

Apparatus and method for register control in web processing apparatus - Apr 28, 1981

US4264956

Call cost monitor - Apr 28, 1981

US4264955

Signal voter - Apr 28, 1981

US4264954

Distributed function communication system for remote devices - Apr 28, 1981

US4264953

Virtual cache - Apr 28, 1981

US4264952

Inverter apparatus - Apr 28, 1981

US4264951

DC Power transmission control - Apr 28, 1981

US4264950

Intrinsically safe regulated power supply - Apr 28, 1981

US4264949

DC to DC power supply - Apr 28, 1981

US4264948

Beacon lamp which emits a conical beam - Apr 28, 1981

US4264947

Reflector arrangement for providing high intensity, uniform and specular illumination of a relatively large exposure area - Apr 28, 1981

US4264946

Electric light fixture - Apr 28, 1981

US4264945

Vertical indicia displaying and energy supply column - Apr 28, 1981

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