Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Ground start detection in telephone loop signalling circuit

Ground start detection in telephone loop signalling circuit

US Patent 4535201 · Granted Aug 13, 1985

Estimated economic value: $6,626,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Three-dimensional measurement apparatus2021
Stereo camera and image pickup system2020
Surveillance camera control device and video surveillance system2017
Object detecting device and object detecting method2016
Surveillance camera system having camera malfunction detection function to detec2015
Detection of ground or loop start configuration in telephone loop signalling cir1986
Detection of ground or loop start configuration in telephone loop signalling cir1986
Method of and apparatus for modifying a video signal to inhibit recording thereo1984
Optical transmitting and receiving apparatus1984
Scrambling and unscrambling video signals in a pay TV system1983