Inventor · disambiguated record
David A. Spence
Also filed as: SPENCE DAVID · SPENCE DAVID A · SPENCE DAVID ALAN · SPENCE JR DAVID ALAN
6 granted patents·1 pending application·89 citations·filing 1980–2017
79Inventor score
Top patents by PatentIndex Score
7 records- 0192US5297921AReleasable locking deviceRITE HITE CORP·Filed 1993·Granted Mar 29, 1994·75 cites·15 claims
- 0270US9938669B2Roadworthy rail ballast regulatorNORDCO INC·Filed 2015·Granted Apr 10, 2018·2 cites·8 claims
- 0364USD268597SDrawing templateBEROL CORP·Filed 1980·Granted Apr 12, 1983·10 cites·1 claims
- 0458US8107240B2Electronic gaming machine interface systemSPENCE JR DAVID ALAN·Filed 2010·Granted Jan 31, 2012·2 cites·13 claims
- 0542US2015083914A1Railway reference machine having a collapsible projector assemblyNORDCO INC·Filed 2014·Application pending·0 cites
- 0641US10433525B1Illuminated dog beltSPENCE DAVID A·Filed 2017·Granted Oct 8, 2019·0 cites·14 claims
- 0740US8675331B2Electronic gaming machine interface systemSPENCE DAVID ALAN·Filed 2012·Granted Mar 18, 2014·0 cites·10 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →