Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Method and apparatus for screening telephone calls

Method and apparatus for screening telephone calls

US Patent 4277649 · Granted Jul 7, 1981

Estimated economic value: $15,170,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

System for processing a call with a TDM network and routing the call with an IP 2013
Technique for providing intelligent features for calls in a communications netwo2011
Technique for providing intelligent features for calls in a communications netwo2009
Method for providing a preferential routing and billing arrangement for a call p2006
Technique for providing intelligent features for calls in a communications netwo2005
Distributed network control and fabric application interface2000