Issued Patents All Time
Showing 1–5 of 5 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 8611057 | LED module for sign channel letters and driving circuit | Francis J. Parker, Robert Crawbuck | 2013-12-17 |
| 8305717 | LED modules for sign channel letters and driving circuit | Francis J. Parker, Robert Crawbuck | 2012-11-06 |
| 7589476 | Power supply for external electrode fluorescent lamps | Francis J. Parker, Robert Crawbuck | 2009-09-15 |
| 7477021 | Non-discontinuous neon power supply with high power factor | Francis J. Parker, Robert Crawbuck | 2009-01-13 |
| 5892646 | Ground fault protection of gas lamp power supplies | Francis J. Parker, Richard Crawbuck | 1999-04-06 |