Patent Leaderboard
USPTO Patent Rankings Data through Dec 31, 2025
Home › Apparatus for and method of checking the validity of directory numbers in a device for interfacing communications equipment to a telephone line

Apparatus for and method of checking the validity of directory numbers in a device for interfacing communications equipment to a telephone line

US Patent 5917807 · Granted Jun 29, 1999

Estimated economic value: $17,751,000 ⓘ

Assignee

Inventors

View full patent text on Google Patents →

More Patents by These Inventors

Wirelessly powered and controlled robotic apparatus2022
Client user interface activity affinity scoring and tracking2021
Streaming events analysis for search recall improvements2020
Streaming events modeling for information ranking to address new information sce2020
Control of ambient and stray lighting in a head mounted display2019
Streaming events modeling for information ranking2019
Control of ambient and stray lighting in a head mounted display2016
Sensor-initiated exchange of information between devices2012