Robert J. Spercel

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Cleveland, OH, US

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Patents Grantslast 30 patents

Information Patent Grant
Tuning device
- Patent number 5,381,715
- Issue date Jan 17, 1995
- Robert J. Spercel
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Tuning device
- Patent number 4,625,614
- Issue date Dec 2, 1986
- Robert J. Spercel
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Guitar string tuning device housing
- Patent number D267410
- Issue date Dec 28, 1982
- Robert J. Spercel
- D17 - Musical instruments
Information Patent Grant
Tuning device
- Patent number 4,353,280
- Issue date Oct 12, 1982
- Robert J. Spercel
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Guitar string tuning machine
- Patent number D256471
- Issue date Aug 19, 1980
- Robert J. Spercel
- D17 - Musical instruments
Information Patent Grant
Tuning device
- Patent number 4,191,086
- Issue date Mar 4, 1980
- Robert J. Spercel
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Guitar string tuning device
- Patent number 4,014,239
- Issue date Mar 29, 1977
- Robert J. Spercel
- G10 - MUSICAL INSTRUMENTS ACOUSTICS
Information Patent Grant
Bar stock loader and feed mechanisms
- Patent number 3,937,331
- Issue date Feb 10, 1976
- Robert J. Spercel
- B23 - MACHINE TOOLS METAL-WORKING NOT OTHERWISE PROVIDED FOR