Inventor · disambiguated record
Douglas A. Engel
Also filed as: ENGEL DOUGLAS · ENGEL DOUGLAS A
9 granted patents·1 pending application·164 citations·filing 1981–2009
90Inventor score
Top patents by PatentIndex Score
10 records- 0187US7309064B1Puzzle with meshing gear sectionsENGEL DOUGLAS A·Filed 2005·Granted Dec 18, 2007·17 cites·10 claims
- 0278US4415158APuzzleGEN SYMMETRICS INC·Filed 1981·Granted Nov 15, 1983·36 cites·12 claims
- 0375US4735418APuzzle amusement deviceENGEL DOUGLAS A·Filed 1987·Granted Apr 5, 1988·32 cites·15 claims
- 0466USD396658SLinked moebius bandENGEL DOUGLAS A·Filed 1997·Granted Aug 4, 1998·14 cites·1 claims
- 0557US4487417APuzzle amusement deviceENGEL DOUGLAS A·Filed 1982·Granted Dec 11, 1984·13 cites·2 claims
- 0653US6109818ARecombinatorFiled 1998·Granted Aug 29, 2000·14 cites·15 claims
- 0752US5094132AAdjustable hand wrenchENGEL DOUGLAS A·Filed 1990·Granted Mar 10, 1992·16 cites·2 claims
- 0851US5106093APuzzle amusement deviceENGEL DOUGLAS A·Filed 1991·Granted Apr 21, 1992·16 cites·6 claims
- 0949USD364663SRubber ballENGEL DOUGLAS A·Filed 1994·Granted Nov 28, 1995·6 cites·1 claims
- 1044US2011078346A1Computer Networking Device and Method ThereofO'CONNOR MICHAEL·Filed 2009·Application pending·0 cites
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →