P

Inventor

LEFF KENNETH J

US6 patents
⚠️ This page may combine multiple inventors who share the name “LEFF KENNETH J”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

ADT INC

3 patents
US4687924AAug 18, 1987

Modular transceiver with adjustable specular member

ADT INC102 citations93
US4749871AJun 7, 1988

Self-diagnostic projected-beam smoke detector

ADT INC26 citations89
US4823015AApr 18, 1989

Electrical interference free projected beam smoke detector

ADT INC23 citations79

AMERICAN DISTRICT TELEGRAPH CO

2 patents
US4544836AOct 1, 1985

Optically-based access control system

AMERICAN DISTRICT TELEGRAPH CO93 citations95
US4679881AJul 14, 1987

Electrical interconnection apparatus and technique

AMERICAN DISTRICT TELEGRAPH CO42 citations92

PITTWAY CORP

1 patent
US5476397ADec 19, 1995

Wire terminal clamp

PITTWAY CORP6 citations54