Richard K. Shipman

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Woodstock, GA, US

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Patents Grantslast 30 patents

Information Patent Grant
Integrated cocot and regulated paystation telephone system
- Patent number 5,311,582
- Issue date May 10, 1994
- International Teleservice Corporation
- Marcus K. Davenport
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Circuit for firing paystation coin relay using power derived from t...
- Patent number 5,216,707
- Issue date Jun 1, 1993
- International Teleservice Corp.
- Marcus K. Davenport
- H04 - ELECTRIC COMMUNICATION TECHNIQUE
Information Patent Grant
Answer supervision circuit for paystation telephone with non-muted...
- Patent number 5,187,739
- Issue date Feb 16, 1993
- International Teleservice Corp.
- Marcus K. Davenport
- H04 - ELECTRIC COMMUNICATION TECHNIQUE