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Assignee

ENG SYST

8 patents

Top patents by PatentIndex Score

US4022038AMay 10, 1977

Magnetically operated locking device and key

ENG SYST46 citations92
US4117462ASep 26, 1978

Ultrasonic transmitter for burglar alarm system

ENG SYST21 citations81
US4023157AMay 10, 1977

Theft alarm for portable articles

ENG SYST30 citations81
US4365750ADec 28, 1982

Adjustable sprinkler system

ENG SYST19 citations73
US4280025AJul 21, 1981

Lockable cover assembly for push-button key pad

ENG SYST8 citations73
US4106442AAug 15, 1978

Device for increasing fuel economy of an internal combustion engine

ENG SYST7 citations73
US4097809AJun 27, 1978

Local event broadcast system

ENG SYST12 citations73
US4164911AAug 21, 1979

Apparatus for re-inking printing ribbons

ENG SYST6 citations56