Assignee
DUPONT STEPHEN
7 granted patents·62 citations·filing 1987–2007
Top patents by PatentIndex Score
7 records- 0162US7509930B2Internal combustion barrel engineDUPONT STEPHEN·Filed 2007·Granted Mar 31, 2009·4 cites·7 claims
- 0259US4867719AHydrofoil oar with movable outriggerDUPONT STEPHEN·Filed 1988·Granted Sep 19, 1989·13 cites·20 claims
- 0358US5248272AForwards facing rowing apparatus with feathering of the oar bladesDUPONT STEPHEN·Filed 1992·Granted Sep 28, 1993·13 cites·36 claims
- 0452US4943250AArticulated hydrofoil oarDUPONT STEPHEN·Filed 1989·Granted Jul 24, 1990·10 cites·22 claims
- 0550US4776821AForwards facing hydrofoil oarDUPONT STEPHEN·Filed 1987·Granted Oct 11, 1988·9 cites·5 claims
- 0648US4867718AHydrofoil oarDUPONT STEPHEN·Filed 1988·Granted Sep 19, 1989·8 cites·16 claims
- 0742USD417279SAcoustical horn for behind-the-ear hearing aidDUPONT STEPHEN·Filed 1998·Granted Nov 30, 1999·5 cites·1 claims
Join the waitlist — get patent alerts
Get an alert when DUPONT STEPHEN files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Counts cover granted patents and pending applications in the PatentIndex corpus. How scoring works →