Inventor · disambiguated record
Douglas W. Carlson
Also filed as: CARLSON DOUGLAS W
10 granted patents·324 citations·filing 1977–1996
92Inventor score
Top patents by PatentIndex Score
10 records- 0195US5430087ACarbon black pair with different particle size and improved rubber stockHYDRIL CO·Filed 1993·Granted Jul 4, 1995·91 cites·11 claims
- 0291US5294253ACarbon black system and improved rubber stockHYDRIL CO·Filed 1993·Granted Mar 15, 1994·52 cites·13 claims
- 0387US4083260AEndless power transmission beltDAYCO CORP·Filed 1977·Granted Apr 11, 1978·23 cites·20 claims
- 0472US5713581AFibrous seal for blowout preventerHYDRIL CO·Filed 1996·Granted Feb 3, 1998·44 cites·7 claims
- 0566US5100950ARubber and fluorocarbon micropowder compositionHYDRIL CO·Filed 1988·Granted Mar 31, 1992·18 cites·12 claims
- 0662US5465759AVariable diameter pipe protectorHYDRIL CO·Filed 1994·Granted Nov 14, 1995·38 cites·9 claims
- 0755US5542454AFree flow low energy pipe protectorHYDRIL CO·Filed 1994·Granted Aug 6, 1996·29 cites·7 claims
- 0844US5339864ASafety sub for retaining drilling fluidsHYDRIL CO·Filed 1993·Granted Aug 23, 1994·11 cites·26 claims
- 0935US5180137ARam type blowout preventer having improved ram front packingsHYDRIL CO·Filed 1991·Granted Jan 19, 1993·11 cites·16 claims
- 1031US5364064ASafety sub with asymmetrical wall elastomeric closure for retaining drilling fluidsHYDRIL CO·Filed 1994·Granted Nov 15, 1994·7 cites·35 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →