Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Writing instrument for electronic counting and gravity switch reset

Writing instrument for electronic counting and gravity switch reset

US Patent 4833697 · Granted May 23, 1989

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Writing instrument with solar-powered electronic counting and liquid cyrstal dis1988
Writing instrument with solar-powered electronic counting and liquid cyrstal dis1988
Foldable eyeshade1987