U.S. patents available from 1976 to present.
U.S. patent applications available from 2005 to present.

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Thomas Edison ; 1889

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Assignee: American Motor Inns, Inc.

Location: Roanoke, VA
No. of patents: 1

Number	Title	Issue Date
3987247	Data signalling unit for telephone systems A data signalling system for in-house telephone systems of either the rotary dial or the tone dial type responds to conventional digit defining dial signals. Control gates respond to conventional trunk relay signal patterns to trigger various logic functi...	10/19/1976