Issued Patents All Time
Showing 26–30 of 30 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4724000 | Powdered metal valve seat insert | Sundaram L. Narasimhan, David L. Bonesteel, John N. Gilmer | 1988-02-09 |
| 4547229 | Solution heat treating of engine poppet valves | Lawrence F. Jenkins, James E. Belmore | 1985-10-15 |
| 4351292 | Poppet valve shield | Roger P. Worthen | 1982-09-28 |
| 4346870 | Thermal barrier for poppet valve | Richard Chute, Theodore N. Tunnecliffe, Roger P. Worthen | 1982-08-31 |
| 4270496 | Welded article and method of making same | Sundaram L. Narasimhan | 1981-06-02 |