Inventor · disambiguated record
David W. Hagelbarger
Also filed as: HAGELBARGER DAVID W · HAGELBARGER DAVID WILLIAM
4 granted patents·243 citations·filing 1975–1989
81Inventor score
Top patents by PatentIndex Score
4 records- 0194US4291198AGeneral-purpose electronic telephone station setBELL TELEPHONE LABOR INC·Filed 1979·Granted Sep 22, 1981·151 cites·25 claims
- 0289US5009477AOptical interconnect arrangementAT & T BELL LAB·Filed 1989·Granted Apr 23, 1991·71 cites·19 claims
- 0378USD263824SGeneral-purpose electronic telephone set baseBELL TELEPHONE LABORATORIES INCORPORATED·Filed 1979·Granted Apr 13, 1982·14 cites·1 claims
- 0451US4007459AMultitone pushbutton dial phase shift scanning circuitryBELL TELEPHONE LABOR INC·Filed 1975·Granted Feb 8, 1977·7 cites·25 claims
Join the waitlist — get patent alerts
Get an alert when David W. Hagelbarger files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →