Inventor

MEANS DONALD R

US6 patents

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

AMERICAN TELEPHONE & TELEGRAPH

2 patents

US4847897AJul 11, 1989

Adaptive expander for telephones

AMERICAN TELEPHONE & TELEGRAPH31 citations90

US4700382AOct 13, 1987

Voice-switched telephone circuit with center idle state

AMERICAN TELEPHONE & TELEGRAPH21 citations75

CARRIER CORP

1 patent

US7755220B2Jul 13, 2010

Power stealing for a thermostat using a TRIAC with FET control

CARRIER CORP132 citations95

AT & T BELL LAB

1 patent

US4488006ADec 11, 1984

Apparatus for controlling the application of telephone line power in a telephone set

AT & T BELL LAB22 citations76

AT & T CORP

1 patent

US5388153AFeb 7, 1995

Apparatus and method for detecting telephone line status

AT & T CORP15 citations68

BELL TELEPHONE LABOR INC

1 patent

US4413159ANov 1, 1983

Dial pulsing circuit

BELL TELEPHONE LABOR INC4 citations59