Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Countdown timer

Countdown timer

US Patent 4451158 · Granted May 29, 1984

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Notebook binder1992
Loose-leaf notebook construction1990
Vision and hand/eye coordination exercising and testing machine1989
Nautical high visibility device1987
Countdown timer1985
Method of disclosing dental plaque with D and C Red 331981