Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Locking mechanism for annular blowout preventer

Locking mechanism for annular blowout preventer

US Patent 4438900 · Granted Mar 27, 1984

Estimated economic value: $3,643,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Fracturing systems and methods with rams2021
Blowout preventer with packer assembly and method of using same2016
Blowout preventer translating shaft locking system2013
Shearing sealing ram2007
Bathing enclosure wall panel2003
Ram type blowout preventor2000
Ram-type blowout preventer1997
Long life, low air permeable pressurized articles such as play balls1997
Modular electrical wiring system1995
Illusion creating for amusement and education1994
Blowout preventer bonnet seal carrier1992
Protector for intravenous and syringe needles1991