Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5903137 | Battery pack with single charge inhibit/regulator transistor | Joseph F. Freiman, Nathan Mitchell | 1999-05-11 |
| 5861812 | Battery pack wakeup | Nathan Mitchell, Joseph F. Freiman | 1999-01-19 |
| 5831350 | System using interchangeable nickel-based and lithium ion battery packs | Nathan Mitchell, Joseph F. Freiman | 1998-11-03 |
| 5764028 | Battery pack with single charge-inhibit/regulator transistor | Joseph F. Freiman, Nathan Mitchell | 1998-06-09 |
| 5726554 | Charging a battery having a nominal critical terminal voltage | Joseph F. Freiman, Nathan Mitchell | 1998-03-10 |
| 5641587 | Battery pack with a monitoring circuit for a known system | Nathan Mitchell, Joseph F. Freiman | 1997-06-24 |