Inventor · disambiguated record
William D. Chapman
Also filed as: CHAPMAN WILLIAM D
3 granted patents·1 pending application·36 citations·filing 1989–2008
71Inventor score
Top patents by PatentIndex Score
4 records- 0170US8496064B2System and method for engaging completions in a wellboreDU MICHAEL H·Filed 2007·Granted Jul 30, 2013·12 cites·24 claims
- 0237US2009078429A1System and method for engaging well equipment in a wellboreSCHLUMBERGER TECHNOLOGY CORP·Filed 2008·Application pending·0 cites
- 0333US5611398ATwo-piece drilling flangeDUHN IND·Filed 1995·Granted Mar 18, 1997·16 cites·16 claims
- 0430US4974676AGround subsiding wellheadDUHN OIL TOOL INC·Filed 1989·Granted Dec 4, 1990·8 cites·19 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →