Issued Patents 1982
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4345106 | Method of and apparatus for detecting the level of molten glass in a glass melting furnace | Sheldon A. Canfield | 1982-08-17 |
| 4340965 | Method of and apparatus for detecting and circumventing malfunctions in a current-loop communications system | John T. Beckman | 1982-07-20 |
| 4312657 | Method of and apparatus for sensing the level of molten glass in a glass melting furnace | Sheldon A. Canfield | 1982-01-26 |