Inventor · disambiguated record
David Stephenson
Also filed as: STEPHENSON DAVID · STEPHENSON DAVID J · STEPHENSON DAVID JOHN
14 granted patents·2 pending applications·499 citations·filing 1982–2023
92Inventor score
Files withDEEP CASING TOOLS LTD4WEATHERFORD LAMB3STEPHENSON DAVID2APV CORP LTD1HEWLETT PACKARD DEVELOPMENT CO1
Top patents by PatentIndex Score
16 records- 0197US6840325B2Expandable connection for use with a swelling elastomerWEATHERFORD LAMB·Filed 2002·Granted Jan 11, 2005·96 cites·23 claims
- 0295US8621241B1Storage and recovery of cryptographic key identifiersSTEPHENSON DAVID·Filed 2008·Granted Dec 31, 2013·242 cites·19 claims
- 0392US7578043B2Coupling tubularsWEATHERFORD LAMB·Filed 2006·Granted Aug 25, 2009·53 cites·25 claims
- 0487US4511539ARecovery of precious metalJOHNSON MATTHEY PLC·Filed 1984·Granted Apr 16, 1985·27 cites·21 claims
- 0585US5681499AMethod and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefromVESUVIUS CRUCIBLE CO·Filed 1995·Granted Oct 28, 1997·28 cites·25 claims
- 0671US12173574B2Method and apparatus for well tubular flotationDEEP CASING TOOLS LTD·Filed 2023·Granted Dec 24, 2024·0 cites·10 claims
- 0764US7144243B2Tubing expansionWEATHERFORD LAMB·Filed 2002·Granted Dec 5, 2006·20 cites·34 claims
- 0863US5593726AHot isostatic pressing process for applying wear and corrosion resistant coatingsAPV CORP LTD·Filed 1994·Granted Jan 14, 1997·25 cites·22 claims
- 0962US11828119B2Method and apparatus for well tubular flotationDEEP CASING TOOLS LTD·Filed 2021·Granted Nov 28, 2023·0 cites·11 claims
- 1054US8892907B2Storage and recovery of cryptographic key identifiersNETAPP INC·Filed 2013·Granted Nov 18, 2014·0 cites·20 claims
- 1148US10934796B2Method for removing casing from a wellboreDEEP CASING TOOLS LTD·Filed 2018·Granted Mar 2, 2021·0 cites·18 claims
- 1247US10907439B2Apparatus and method for well tubular flotationDEEP CASING TOOLS LTD·Filed 2019·Granted Feb 2, 2021·0 cites·7 claims
- 1346US4469666ACatalyst units for producing hydrocyanic acidJOHNSON MATTHEY CO LTD·Filed 1982·Granted Sep 4, 1984·8 cites·4 claims
- 1446US2010306253A1Tiered Managed Storage ServicesHEWLETT PACKARD DEVELOPMENT CO·Filed 2009·Application pending·0 cites
- 1542US8075813B2Tubing expansionSTEPHENSON DAVID·Filed 2006·Granted Dec 13, 2011·0 cites·27 claims
- 1634US2004017081A1Coupling tubularsFiled 2003·Application pending·0 cites
Join the waitlist — get patent alerts
Get an alert when David Stephenson files or is granted a new patent.
We store only your email — no account needed. See our privacy policy.
Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →