Inventor
SHAPIRO L DENNIS
11 patents
⚠️ This page may combine multiple inventors who share the name “SHAPIRO L DENNIS”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
LIFELINE SYSTEMS INC
6 patentsUS4524243AJun 18, 1985
Personal alarm system
LIFELINE SYSTEMS INC142 citations97
US4760593AJul 26, 1988
Personal alarm system providing handsfree operation
LIFELINE SYSTEMS INC79 citations94
US5091930AFeb 25, 1992
Enhancement of a personal emergency response system
LIFELINE SYSTEMS INC23 citations92
US4884060ANov 28, 1989
Multi-state selection switch for a personal emergency response system
LIFELINE SYSTEMS INC35 citations92
US4686697AAug 11, 1987
Telephone care system with telephone line-checking
LIFELINE SYSTEMS INC74 citations90
US4884059ANov 28, 1989
Apparatus and method for reporting verification testing of a personal emergency response system
LIFELINE SYSTEMS INC18 citations73
AMERICAN DISTRICT TELEGRAPH CO
3 patentsUS3932870AJan 13, 1976
On-line test circuit for intrusion alarm systems
AMERICAN DISTRICT TELEGRAPH CO24 citations82
US3938118AFeb 10, 1976
Multizone intrusion alarm system
AMERICAN DISTRICT TELEGRAPH CO7 citations73
US4117479ASep 26, 1978
Multi-mode intrusion alarm system
AMERICAN DISTRICT TELEGRAPH CO19 citations69