Patent Leaderboard

USPTO Patent Rankings Data through Dec 31, 2025

Search Companies Inventors Cities States

Home › Well drilling tool

Well drilling tool

US Patent 4308927 · Granted Jan 5, 1982

Assignee

Engineering Enterprises

Inventors

Fred K. Fox (9 patents)

View full patent text on Google Patents →

More Patents by These Inventors

Well drilling tool1981

Well drilling tool1981

Well drilling tool1981

Well drilling tool1981

Magnetic lens system for corpuscular radiation equipment1980

Magnetic lens arrangement for corpuscular radiation equipment working under a va1980

Well drilling tool1980

Data from USPTO via PatentsView — © 2026 Patent Leaderboard

Last updated: Dec 31, 2025 · Updated quarterly