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VARCO SHAFFER INC

Overview
  • Total Patents
    51
About

VARCO SHAFFER INC has a total of 51 patent applications. Its first patent ever was published in 1993. It filed its patents most often in United States, United Kingdom and Brazil. Its main competitors in its focus markets civil engineering, machines and mechanical elements are STINGER WELLHEAD PROT INC, OIL CT TOOL COMPANY and ATLAS COPCO CANADA INC.

Patent filings per year

Chart showing VARCO SHAFFER INCs patent filings per year from 1900 to 2020

Focus industries

Top inventors

# Name Total Patents
#1 Levett Bryce A 13
#2 Brugman James D 9
#3 Whitby Melvyn F 8
#4 Elkins Hubert L 7
#5 Merit Mark A 7
#6 O'Donnell David L 6
#7 Mclelland Mark W 5
#8 Le Tri Canh 5
#9 Johnson Christopher D 5
#10 Tisdale George W 5

Latest patents

Publication Filing date Title
US2005224224A1 Subsea coiled tubing injector with pressure compensation
US6857634B2 BOP assembly with metal inserts
US6719042B2 Shear ram assembly
US6374925B1 Well drilling method and system
US6244560B1 Blowout preventer ram actuating mechanism
US6192680B1 Subsea hydraulic control system
BR9706382A Leak protector with partially equalized ram
GB9715658D0 Mechanical riser pin and box coupling and method
US5897094A BOP with improved door connectors
US5735502A BOP with partially equalized ram shafts
US5778918A Pilot valve with improved cage
US5575452A Blowout preventer with ram wedge locks
US5588491A Rotating blowout preventer and method
US5505426A Hydraulically controlled blowout preventer
US5400857A Oilfield tubular shear ram and method for blowout prevention