Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 6270249 | Vertically reciprocating perforated agitator | David C. Estrich, Reason Bradley, Robert G. Ullrich | 2001-08-07 |
| 5828223 | Universal chip tester interface device | Richard Rabkin, Ken Berling, James Lubin, David C. Estrich | 1998-10-27 |