Patent Leaderboard

USPTO Patent Rankings Data through Dec 31, 2025

Search Companies Inventors Cities States

Home › Portable spirometer

Portable spirometer

US Patent D325634 · Granted Apr 21, 1992

Assignee

Welch Allyn

Inventors

Paul B. Sweeney (4 patents)

View full patent text on Google Patents →

More Patents by These Inventors

Spirometer base unit1993

Sewer cleaning machine1983

Powered collator1981

Data from USPTO via PatentsView — © 2026 Patent Leaderboard

Last updated: Dec 31, 2025 · Updated quarterly