Inventor · disambiguated record
Charles A. Bollfrass
Also filed as: BOLLFRASS CHARLES A
7 granted patents·1 pending application·452 citations·filing 1977–2007
89Inventor score
Top patents by PatentIndex Score
8 records- 0195US4373754AThreaded connectorHYDRIL CO·Filed 1981·Granted Feb 15, 1983·230 cites·20 claims
- 0288US4928999AElastomeric guard seal for tubular connectionsHYDRIL CO·Filed 1984·Granted May 29, 1990·65 cites·17 claims
- 0378US4588213AThreaded pipe connectionTHREAD TECHNOLOGY INTERNATIONA·Filed 1983·Granted May 13, 1986·60 cites·10 claims
- 0474US4893844ATubular coupling with ventable sealBAKER HUGHES INC·Filed 1985·Granted Jan 16, 1990·41 cites·2 claims
- 0569US5029906AMethod and apparatus for forming a ventable sealBAKER HUGHES INC·Filed 1989·Granted Jul 9, 1991·34 cites·5 claims
- 0660US6925954B1Systems and methods for allowing underwater escape from a submarineFiled 2004·Granted Aug 9, 2005·11 cites·34 claims
- 0755US2009320953A1Interstitially Insulated Pipes and Connection TechnologiesTEXAS A & M UNIV SYS·Filed 2007·Application pending·0 cites
- 0852US4133095ATreating, including induction heating of well pipe connectionsHYDRIL CO·Filed 1977·Granted Jan 9, 1979·11 cites·16 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →