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.
# | Country | Total Patents | |
---|---|---|---|
#1 | United States | 16 | |
#2 | United Kingdom | 9 | |
#3 | Brazil | 7 | |
#4 | Norway | 7 | |
#5 | Canada | 3 | |
#6 | France | 3 | |
#7 | Australia | 2 | |
#8 | WIPO (World Intellectual Property Organization) | 2 | |
#9 | Germany | 1 | |
#10 | EPO (European Patent Office) | 1 |
# | Industry | |
---|---|---|
#1 | Civil engineering | |
#2 | Machines | |
#3 | Mechanical elements |
# | Technology | |
---|---|---|
#1 | Earth drilling | |
#2 | Venting or aerating devices | |
#3 | Unspecified technologies | |
#4 | Unspecified technologies | |
#5 | Pipes | |
#6 | Servomotors |
# | 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 |
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 |