DS

David Stephenson

WE Weatherford/Lamb: 4 patents #167 of 852Top 20%
DL Deep Casing Tools Limited: 4 patents #3 of 9Top 35%
NE Netapp: 2 patents #822 of 1,846Top 45%
AP Apv: 1 patents #5 of 21Top 25%
VC Vesuvius Crucible: 1 patents #42 of 106Top 40%
JL Johnson Matthey Public Limited: 1 patents #446 of 922Top 50%
JP Johnson Matthey Plc: 1 patents #58 of 155Top 40%
Overall (All Time): #340,594 of 4,157,543Top 9%
14
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
12173574 Method and apparatus for well tubular flotation Tomasz Jozef Walerianczyk 2024-12-24
11828119 Method and apparatus for well tubular flotation Tomasz Jozef Walerianczyk 2023-11-28
10934796 Method for removing casing from a wellbore Tomasz Jozef Walerianczyk, Neil Andrew Abercrombie Simpson 2021-03-02
10907439 Apparatus and method for well tubular flotation Tomasz Jozef Walerianczyk 2021-02-02
8892907 Storage and recovery of cryptographic key identifiers 2014-11-18
8621241 Storage and recovery of cryptographic key identifiers 2013-12-31
8075813 Tubing expansion Grant Adams, David Grant, Neil Andrew Abercrombie Simpson 2011-12-13
7578043 Coupling tubulars Neil Andrew Abercrombie Simpson, Simon J. Harrall, Paul David Metcalfe, Neil James Glover, Andrew Duggan 2009-08-25
7144243 Tubing expansion Grant Adams, David Grant, Neil Andrew Abercrombie Simpson 2006-12-05
6840325 Expandable connection for use with a swelling elastomer 2005-01-11
5681499 Method and compositions for making refractory shapes having dense, carbon free surfaces and shapes made therefrom Paul M. Benson, Duane L. Debastiani, Quentin K. Robinson, Phillipe Dumas, Eric Hanse 1997-10-28
5593726 Hot isostatic pressing process for applying wear and corrosion resistant coatings John Nicholls, Geoffrey Frederick Archer 1997-01-14
4511539 Recovery of precious metal 1985-04-16
4469666 Catalyst units for producing hydrocyanic acid Alan E. Heywood, Gordon L. Selman 1984-09-04