Individual holder
ENGEL DOUGLAS A
US·7 granted patents·114 citations·filing 1982–2005
Individually held — no corporate assignee on record.
Top patents by PatentIndex Score
7 records- 0187US7309064B1Puzzle with meshing gear sectionsENGEL DOUGLAS A·Filed 2005·Granted Dec 18, 2007·17 cites·10 claims
- 0275US4735418APuzzle amusement deviceENGEL DOUGLAS A·Filed 1987·Granted Apr 5, 1988·32 cites·15 claims
- 0366USD396658SLinked moebius bandENGEL DOUGLAS A·Filed 1997·Granted Aug 4, 1998·14 cites·1 claims
- 0457US4487417APuzzle amusement deviceENGEL DOUGLAS A·Filed 1982·Granted Dec 11, 1984·13 cites·2 claims
- 0552US5094132AAdjustable hand wrenchENGEL DOUGLAS A·Filed 1990·Granted Mar 10, 1992·16 cites·2 claims
- 0651US5106093APuzzle amusement deviceENGEL DOUGLAS A·Filed 1991·Granted Apr 21, 1992·16 cites·6 claims
- 0749USD364663SRubber ballENGEL DOUGLAS A·Filed 1994·Granted Nov 28, 1995·6 cites·1 claims
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