Inventor
MCMAHON DONALD H
US47 patents
⚠️ This page may combine multiple inventors who share the name “MCMAHON DONALD H”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SPERRY CORP
17 patentsUS4516837AMay 14, 1985
Electro-optical switch for unpolarized optical signals
SPERRY CORP180 citations99
US4461543AJul 24, 1984
Electro optic switch
SPERRY CORP107 citations96
US4432599AFeb 21, 1984
Fiber optic differential sensor
SPERRY CORP69 citations96
US4293188AOct 6, 1981
Fiber optic small displacement sensor
SPERRY CORP109 citations96
US4278327AJul 14, 1981
Liquid crystal matrices
SPERRY CORP108 citations96
US4208651AJun 17, 1980
Fingerprint identification by ridge angle and minutiae recognition
SPERRY CORP79 citations96
US4201442AMay 6, 1980
Liquid crystal switching coupler matrix
SPERRY CORP96 citations96
US4519252AMay 28, 1985
Pressure and temperature compensated photoelastic hydrophone
SPERRY CORP31 citations93
US4421384ADec 20, 1983
Fiber optic transducer
SPERRY CORP36 citations93
US4291976ASep 29, 1981
Digital fiber optic position sensor
SPERRY CORP46 citations93
US4302835ANov 24, 1981
Multiple terminal passive multiplexing apparatus
SPERRY CORP28 citations82
US4300122ANov 10, 1981
Apparatus for processing digital data representative of a two-dimensional image
SPERRY CORP26 citations82
US4595830AJun 17, 1986
Multimode optical fiber accelerometer
SPERRY CORP19 citations74
US4518857AMay 21, 1985
Temperature and pressure compensated elasto-optic sensor
SPERRY CORP18 citations74
US4636636AJan 13, 1987
Microwatt battery powered optical sensor
SPERRY CORP3 citations63
US4265509AMay 5, 1981
High speed holographic optical printing system
SPERRY CORP6 citations63
US4185884AJan 29, 1980
Four port optical internal reflectance switchable coupler
SPERRY CORP6 citations63
SPERRY RAND CORP
15 patentsUS3975711AAug 17, 1976
Real time fingerprint recording terminal
SPERRY RAND CORP208 citations99
US4021097AMay 3, 1977
Distributive tee coupler
SPERRY RAND CORP68 citations96
US3968476AJul 6, 1976
Spurious signal removal in optical processor fingerprint identification apparatus
SPERRY RAND CORP134 citations96
US3968475AJul 6, 1976
Digital processor for extracting data from a binary image
SPERRY RAND CORP76 citations96
US4152723AMay 1, 1979
Method of inspecting circuit boards and apparatus therefor
SPERRY RAND CORP69 citations95
US4175827ANov 27, 1979
Electro-optical multiplexer having multiple frequency resonant excitation
SPERRY RAND CORP53 citations93
US4130342ADec 19, 1978
Passive optical channel crossover, switch and bend structure
SPERRY RAND CORP39 citations93
US4099875AJul 11, 1978
Coaxial multi-detector system and method for measuring the extinction coefficient of an atmospheric scattering medium
SPERRY RAND CORP37 citations92
US4181399AJan 1, 1980
Optical internal reflectance switchable coupler
SPERRY RAND CORP26 citations82
US4107518AAug 15, 1978
Optical repeater
SPERRY RAND CORP26 citations82
US4182544AJan 8, 1980
Resonant multiplexer-demultiplexer for optical data communication systems
SPERRY RAND CORP19 citations74
US4160237AJul 3, 1979
Optical reader for multiline image processing
SPERRY RAND CORP8 citations74
US4156555AMay 29, 1979
Apparatus and method for providing unblurred images with a continuously scanned light beam
SPERRY RAND CORP10 citations74
US4094579AJun 13, 1978
Multimode optical waveguide device with non-normal butt coupling of fiber to electro-optic planar waveguide
SPERRY RAND CORP17 citations74
US4116534ASep 26, 1978
Apparatus and method for high speed accessing of character images
SPERRY RAND CORP2 citations63
POLAROID CORP
9 patentsUS5119454AJun 2, 1992
Bulk optic wavelength division multiplexer
POLAROID CORP190 citations99
US4715027ADec 22, 1987
Integrated optic multi/demultiplexer
POLAROID CORP56 citations96
US4695121ASep 22, 1987
Integrated optic resonant structres and fabrication method
POLAROID CORP93 citations95
US4742576AMay 3, 1988
Optical communication system employing coherent detection and method
POLAROID CORP41 citations93
US4736360AApr 5, 1988
Bulk optic echelon multi/demultiplexer
POLAROID CORP47 citations93
US4782492ANov 1, 1988
Thermally controllable optical devices and system
POLAROID CORP27 citations91
US4730301AMar 8, 1988
Wavelength multiplexed optical communications system and method
POLAROID CORP22 citations82
US4707061ANov 17, 1987
Optical communication system employing frequency reference
POLAROID CORP20 citations82
US4715028ADec 22, 1987
Optical communication system
POLAROID CORP12 citations66
DIGITAL EQUIPMENT CORP
4 patentsUS5208692AMay 4, 1993
High bandwidth network based on wavelength division multiplexing
DIGITAL EQUIPMENT CORP77 citations96
US5396239AMar 7, 1995
Data and forward error control coding techniques for digital signals
DIGITAL EQUIPMENT CORP67 citations94
US5144304ASep 1, 1992
Data and forward error control coding techniques for digital signals
DIGITAL EQUIPMENT CORP82 citations94
US5043975AAug 27, 1991
High bandwidth network based on wavelength division multiplexing
DIGITAL EQUIPMENT CORP29 citations93