Issued Patents All Time
Showing 1–6 of 6 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| D611851 | Battery tester | Philip D. Zimmerman | 2010-03-16 |
| D569285 | Battery tester | Philip D. Zimmerman | 2008-05-20 |
| D515444 | Battery tester | Philip D. Zimmerman | 2006-02-21 |
| 6823274 | Apparatus and method for testing remaining capacity of a battery | Phillip David Zimmerman, Gary L. Claypoole | 2004-11-23 |
| 5075580 | Circuit for converting an ECL signal into a CMOS signal | Birney D. Dayton | 1991-12-24 |
| 4757508 | Tracking modulation limiter for lasers | — | 1988-07-12 |