Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5672214 | Concrete solar cell | John R. Arthur, Robert Kurt Graupner, James A. Van Vechten, Ernest G. Wolff | 1997-09-30 |
| 5415700 | Concrete solar cell | John R. Arthur, Robert Kurt Graupner, James A. Van Vechten, Ernest G. Wolff | 1995-05-16 |