Patent Leaderboard

USPTO Patent Rankings Data through Dec 31, 2025

Search Companies Inventors Cities States

Home › Ring binder

Ring binder

US Patent 5180247 · Granted Jan 19, 1993

Assignee

World Wide Stationery Mfg. Co.

Inventors

Cheng-Hui Yu (5 patents)

View full patent text on Google Patents →

More Patents by These Inventors

Paper pickup mechanism2005

Sheet feeding apparatus2002

Paper-feeding apparatus1999

Ring binder1994

Data from USPTO via PatentsView — © 2026 Patent Leaderboard

Last updated: Dec 31, 2025 · Updated quarterly