Trcka James S, Yeoman David C: Backlighted display apparatus for preventing direct viewing of light sources. Collins Radio Company, Lutz Bruce C, January 28, 1975: US3863246 (59 worldwide citation)

Apparatus for providing backlighting of a display comprising the use of louvered material between a light source and the sides of a prism wherein the prism is utilized to transmit and direct light rays to the display surface. The use of the prism in some embodiments eliminates direct viewing of the ...

Rhodes Melvin H: Trigonometric analog-to-digital conversion apparatus. Rockwell International Corporation, Lutz Bruce C, July 22, 1975: US3896299 (19 worldwide citation)

Trigonometric conversion apparatus is shown wherein a trial angle is generated and converted to digital sine and cosine of that angle. These digital angle signals are then multiplied times analog cosine and sine, respectively, and their products are compared wherein the difference is used to adjust ...

Frazier Melvin A: Voltage standing wave ratio detecting and adjusting apparatus. Collins Radio Company, Lutz Bruce C, October 15, 1974: US3842358 (17 worldwide citation)

Hysteresis type detection apparatus for detecting the voltage standing wave ratio (VSWR) of a transmitting system. When the detection apparatus determines that the VSWR exceeds a predetermined value, it actuates a servo-system which adjusts impedances in a coupling unit between the transmitter and t ...

Torgrim Willard J: Clock recovering apparatus and method. Rockwell International Corporation, Lutz Bruce C, July 8, 1975: US3894246 (17 worldwide citation)

A circuit for generating a clock based on time of receipt of a RZ (return to zero) data bit stream using a known clocking frequency. An internal actuated counter is used to generate a lower frequency data clock and is reset to an initial condition whenever the incoming data phase deviates mote than ...

Rhodes Melvin H: Analog-to-digital converter apparatus. Rockwell International Corporation, Lutz Bruce C, February 25, 1975: US3868680 (15 worldwide citation)

The method of and apparatus for converting from an analog vector output signal to a digital output indicative of not only the angle represented by the analog input vectors with respect to a reference but also the digital outputs indicative of sine angle and cosine of the angle. A CORDIC (Coordinate ...

Hallford Ben R, Wright Charles H: Mixer carrier null adjustment. Rockwell International Corporation, Lutz Bruce C, March 11, 1975: US3870960 (14 worldwide citation)

A technique of minimizing local oscillator signals external to a mixer circuit through the reflecting of the local oscillator frequency signals in a balanced rat-race hybrid mixer circuit to minimize the amplitude of the local oscillator signals appearing at the output. This is accomplished by juxta ...

Hanson Russell W: Frequency converting apparatus. Rockwell International Corporation, Lutz Bruce C, January 28, 1975: US3863136 (12 worldwide citation)

A single active element circuit for combining an input signal with a feedback signal to produce an output which is indicative in frequency of the sum and/or the difference of the frequency of the signals being mixed. The resulting circuit can be used in one embodiment for a divide by two or multiply ...

Riethmeier William C: Hold-down/extraction apparatus. Rockwell International Corporation, Lutz Bruce C, March 25, 1975: US3872734 (11 worldwide citation)

A device for assisting insertion of a container into a space and for holding same in said space after insertion with the forces being applied in a first direction having a force component in a hold-down direction while providing extraction forces to said container in a direction substantially perpen ...

Bruene Warren B: FM broadcast exciter apparatus. Rockwell International Corporation, Lutz Bruce C, Crawford Robert J, August 26, 1975: US3902019 (11 worldwide citation)

Apparatus for using a single frequency source for supplying the control frequencies for the carrier, the stereo pilot carrier and the suppressed carrier signals. This is accomplished by using a variable divider in a phase lock loop in a manner such that the entire circuit is digital in operation.

Stoffer C Daniel: Transceiver switching circuit. Rockwell International Corporation, Lutz Bruce C, February 18, 1975: US3867699 (9 worldwide citation)

A switching circuit for use in a transceiver whereby a unidirectional mixer may be used for both transmitting and receiving. The circuit allows the combination of the high gain obtainable from unidirectional active mixers with the versatility of bidirectional operation.