Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 7938707 | Methods for batch fabrication of cold cathode vacuum switch tubes | Charles A. Walker | 2011-05-10 |
| 4793985 | Method of producing ultrafine ground calcium carbonate | Charles R. Price, Albert C. Kunkle | 1988-12-27 |