Inventor · disambiguated record
Robert J. Spercel
Also filed as: SPERCEL ROBERT J
8 granted patents·108 citations·filing 1973–1993
88Inventor score
Files withSPERCEL ROBERT J7
Top patents by PatentIndex Score
8 records- 0172US4625614ATuning deviceSPERCEL ROBERT J·Filed 1985·Granted Dec 2, 1986·26 cites·2 claims
- 0263US5381715ATuning deviceFiled 1993·Granted Jan 17, 1995·18 cites·10 claims
- 0362US4191086ATuning deviceSPERCEL ROBERT J·Filed 1978·Granted Mar 4, 1980·17 cites·26 claims
- 0457USD256471SGuitar string tuning machineSPERCEL ROBERT J·Filed 1977·Granted Aug 19, 1980·6 cites·1 claims
- 0555US4353280ATuning deviceSPERCEL ROBERT J·Filed 1978·Granted Oct 12, 1982·14 cites·25 claims
- 0653USD267410SGuitar string tuning device housingSPERCEL ROBERT J·Filed 1980·Granted Dec 28, 1982·6 cites·1 claims
- 0753US3937331ABar stock loader and feed mechanismsSPERCEL ROBERT J·Filed 1973·Granted Feb 10, 1976·12 cites·19 claims
- 0842US4014239AGuitar string tuning deviceSPERCEL ROBERT J·Filed 1975·Granted Mar 29, 1977·9 cites·29 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →