Issued Patents All Time
Showing 1–9 of 9 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6429903 | Video adapter for supporting at least one television monitor | — | 2002-08-06 |
| 6234882 | Surface enhancement system for building blocks | — | 2001-05-22 |
| 6100936 | Multiple-screen video adapter with television tuner | Douglas A. Jordan, Bruce L. Biskey, Ezra Mintz | 2000-08-08 |
| 6028643 | Multiple-screen video adapter with television tuner | Douglas A. Jordan, Bruce L. Biskey, Ezra Mintz | 2000-02-22 |
| 5818916 | Method and apparatus for preventing return dial tone fraud in a cellular paystation | Allen W. Vogl, Steven E. Betts, Scott G. Turner | 1998-10-06 |
| 5496206 | Building block face enhancement apparatus | — | 1996-03-05 |
| 5311582 | Integrated cocot and regulated paystation telephone system | Marcus K. Davenport, Richard K. Shipman, Stephen H. Strode | 1994-05-10 |
| 5216707 | Circuit for firing paystation coin relay using power derived from telephone line tip/ring voltage | Marcus K. Davenport, Richard K. Shipman, Stephen H. Strode | 1993-06-01 |
| 5187739 | Answer supervision circuit for paystation telephone with non-muted microphone | Marcus K. Davenport, Richard K. Shipman, Stephen H. Strode | 1993-02-16 |