Issued Patents All Time
Showing 1–4 of 4 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886539 | Method of vacuum refining of glassy materials with selenium foaming agent | Richard L. Gerutti, David R. Haskins, Robert B. Heithoff, Ronald L. Schwenninger | 1989-12-12 |
| 4794860 | Foam control method for vacuum refining of glassy materials | — | 1989-01-03 |
| 4780122 | Vacuum refining of glass or the like with enhanced foaming | Ronald L. Schwenninger, Boyd S. Dawson, Joseph M. Matesa, Larry J. Shelestak | 1988-10-25 |
| 4738938 | Melting and vacuum refining of glass or the like and composition of sheet | Gerald E. Kunkle, Ronald L. Schwenninger | 1988-04-19 |