Inventor

LONGENECKER HOWARD H

US2 patents

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

AT & T TECHNOLOGIES INC

1 patent

US4567333AJan 28, 1986

Electronic tone ringer with distinctive signaling circuitry

AT & T TECHNOLOGIES INC9 citations70

AT & T BELL LAB

1 patent

US4491691AJan 1, 1985

Electronic tone ringer

AT & T BELL LAB11 citations70