Issued Patents 1989
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886279 | Circular chess/checkers board method of play | — | 1989-12-12 |
| 4804591 | Fuel cell powerplant employing an aqueous solution | Albert P. Grasso, Wolfgang Vogel | 1989-02-14 |
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4886279 | Circular chess/checkers board method of play | — | 1989-12-12 |
| 4804591 | Fuel cell powerplant employing an aqueous solution | Albert P. Grasso, Wolfgang Vogel | 1989-02-14 |