Patent Leaderboard

USPTO Patent Rankings Data through Dec 31, 2025

Search Companies Inventors Cities States Inventor 500

Home › Vacuum leak detector

Vacuum leak detector

US Patent 4635042 · Granted Jan 6, 1987

Assignee

Unknown

Inventors

Donald R. Andrews (2 patents)

View full patent text on Google Patents →

More Patents by These Inventors

Copy production machines1986

Data from USPTO via PatentsView — © 2026 Patent Leaderboard

Last updated: Dec 31, 2025 · Updated quarterly