Inventor · disambiguated record
Robert J. Sperzel
Also filed as: SPERZEL ROBERT · SPERZEL ROBERT J
13 granted patents·141 citations·filing 1989–2010
92Inventor score
Top patents by PatentIndex Score
13 records- 0180US8093475B1Tuning deviceSPERZEL ROBERT J·Filed 2010·Granted Jan 10, 2012·7 cites·19 claims
- 0276US5438901AString support for musical instrumentFiled 1994·Granted Aug 8, 1995·26 cites·30 claims
- 0369US6608248B1Device for tuning a string of a musical instrumentFiled 2002·Granted Aug 19, 2003·12 cites·23 claims
- 0468US5728955ATuning deviceFiled 1996·Granted Mar 17, 1998·21 cites·46 claims
- 0565US7102065B2Tuning deviceSPERZEL ROBERT J·Filed 2002·Granted Sep 5, 2006·10 cites·68 claims
- 0656US7164073B2String supportSPERZEL ROBERT J·Filed 2005·Granted Jan 16, 2007·1 cites·11 claims
- 0746US6023014AApparatus for changing the tension in a string of a musical instrumentFiled 1998·Granted Feb 8, 2000·10 cites·44 claims
- 0845US6444886B1Musical instrumentFiled 1999·Granted Sep 3, 2002·10 cites·33 claims
- 0945US5492044AString support having a base with string support members and methodFiled 1993·Granted Feb 20, 1996·10 cites·57 claims
- 1041US5696336AString supportFiled 1995·Granted Dec 9, 1997·9 cites·57 claims
- 1141US5045006AFoot loop for a windsurfing boardALPHA INT GMBH·Filed 1989·Granted Sep 3, 1991·9 cites·2 claims
- 1238US5962797AMusical instrumentFiled 1997·Granted Oct 5, 1999·8 cites·4 claims
- 1338US5394783AString support and methodFiled 1993·Granted Mar 7, 1995·8 cites·42 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →