Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Automatic drill string section changer

Automatic drill string section changer

US Patent 4449592 · Granted May 22, 1984

Estimated economic value: $4,109,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Method and apparatus for calibrating rail scales2021
Long-distance delivery system for fishing devices2017
Apparatus for handling a drilling equipment1990
Hydraulic Percussion tool1989
Well pumping unit and control system1988
Pilot operated control valve for hydraulically actuated reciprocating pump1985
Positioning control system for rock drill support apparatus1984
Hydraulically actuated reciprocating piston pump1984
Method of and apparatus for controlling batch thickness and glass level in a gla1982
Rock drill positioning mechanism1981
Positioning control system for rock drill support apparatus1981
Controls for hydraulic percussion drill1981