Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Method for retarding mineral buildup in downhole pumps

Method for retarding mineral buildup in downhole pumps

US Patent 4990233 · Granted Feb 5, 1991

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Method and apparatus for controlling rotary extruder1991
Rotary extruder with internally heated rotor1991
Drying method1990
Rotary extruder with internally cooled rotor1989
Composition for plastic article with unitarily molded foam layer1989
Plastic closure with barrier coating1989
Composition for plastic article with unitarily molded foam layer1989
Drying method and apparatus1989
Rotary extruder with a gear pump1989
Plastic closure with unitarily molded, foamed sealing layer1988
Foamed polymer tubing1987
Heat exchanger apparatus for extruding thermoplastic compositions1986