Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Telephone line hold and hold release apparatus

Telephone line hold and hold release apparatus

US Patent 4674118 · Granted Jun 16, 1987

Estimated economic value: $2,310,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Telephone set1988
Transmitter1987
Telephone set1987
Telephone set1987
Telephone set1986
Telephone set1986