{"@context": "https://schema.org", "@type": "BreadcrumbList", "itemListElement": [{"@type": "ListItem", "position": 1, "name": "Home", "item": "https://www.patentleaderboard.com/"}, {"@type": "ListItem", "position": 2, "name": "Loopback test", "item": "https://www.patentleaderboard.com/patent/4380810"}]}
Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Loopback test

Loopback test

US Patent 4380810 · Granted Apr 19, 1983

Estimated economic value: $36,259,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Method and apparatus for measuring the quality of speech transmissions that use 2010
Communication switch1999
Tone detector with improved performance in the presence of speech1997
Expandable time slot interchanger1994
Digital signal processor synchronous network1993
Method and apparatus for generating digital signals representing periodic sample1988
Timing signal distribution arrangement1987
Dual tone multifrequency and dial pulse receiver1984
Line status detection in a digital concentrator system1983
Concentrator in a subscriber loop digital carrier system1983
Generation of busy signals in a digital concentrator1983
Digital concentrator terminal synchronization1982