Inventor · disambiguated record

Howard H. Longenecker

Also filed as: LONGENECKER HOWARD H

2 granted patents·20 citations·filing 1983–1984

59Inventor score

Technology areasH04M

Files withAT & T BELL LAB1 AT & T TECHNOLOGIES INC1

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2 records

0153US4491691AElectronic tone ringerAT & T BELL LAB·Filed 1983·Granted Jan 1, 1985·11 cites·22 claims
0249US4567333AElectronic tone ringer with distinctive signaling circuitryAT & T TECHNOLOGIES INC·Filed 1984·Granted Jan 28, 1986·9 cites·8 claims

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Howard H. Longenecker — Patent Inventor | PatentIndex