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For the Inventor, By the Inventor

Richardson, TX, United States of America

Tbs International, Inc.


USPTO Granted Patents = 3

Trademarks = 1

Forward Citations = 99

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2 inventors (with patents filed for the assignee):

goldMedal Ellis K Cave (3 out of 38 patents)

silverMedal Neil Hazelwood (1 out of 1 patent)


3 patents:

1. 4599493 - Multi-line telephone control system (1986-07-08),
2. 4405833 - Telephone call progress tone and answer identification circuit (1983-09-20),
3. 4340913 - Tri-level digital recording (1982-07-20),
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USPTO Data Jan 1 1976 - Oct 6 2026

3 Patents

#106 in Richardson, TX

#4,788 in Texas

#73,815 in US

Richardson, TX (US)
Richardson, TX, United States of America

Tbs International, Inc.

Forward Citations = 99

2 inventors:

goldMedal Ellis K Cave (3 out of 38 patents)

silverMedal Neil Hazelwood (1 out of 1 patent)

Please report any incorrect information to [email protected]
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