Patent Leaderboard

USPTO Patent Rankings Data through Dec 31, 2025

Search Companies Inventors Cities States

Home › Manhole cover

Manhole cover

US Patent D666306 · Granted Aug 28, 2012

Assignee

No assignee recorded.

Inventors

Unknown
Thomas D Chapman (3 patents)

View full patent text on Google Patents →

More Patents by These Inventors

Cleaning apparatus, system and method2023

Manhole cover2012

Manhole cover2012

Method and apparatus for business forms compacting1991

Data from USPTO via PatentsView — © 2026 Patent Leaderboard

Last updated: Dec 31, 2025 · Updated quarterly