Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Remotely activated switching apparatus

Remotely activated switching apparatus

US Patent 4807277 · Granted Feb 21, 1989

Estimated economic value: $510,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Methods and apparatus for providing an auxiliary communication line2000
Channel interface unit1996
Channel interface unit1996
Channel interface unit1996
Timing circuit and a secure telephone jack utilizing this circuit1992
Ground start circuit1989
Programmable selective ringing circuit and method for party telephone line1988
Frequency responsive party telephone line selection apparatus and method1987
Telephone off-hook detector circuit1987
Telephone line testing circuit1987
Wood thickness attachment1986
Network interface enclosure1986