John R. Shaffer

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San Jose, CA, US

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Patents Grantslast 30 patents

Information Patent Grant
Music training instrument and method
- Patent number 5,266,735
- Issue date Nov 30, 1993
- Shaffer; John R.
- John R. Shaffer
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Fingering display for musical instrument
- Patent number 4,915,005
- Issue date Apr 10, 1990
- John R. Shaffer
- G10 - MUSICAL INSTRUMENTS ACOUSTICS