Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4869975 | Overvoltage control circuit for a reserve battery | Walter T. Pertuch, Bernard C. Tierney | 1989-09-26 |
| 4800141 | Reserve activated electrochemical cell | Warren E. Hawkins | 1989-01-24 |