Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| RE32744 | Dual layer electrophotographic recording material containing a layer of selenium, arsenic and halogen, and thereabove a layer of selenium and tellurium | Hartmut Dulken, Karlheinz Kassel, Hubert Walsdorfer | 1988-09-06 |
| 4513072 | Dual layer electrophotographic recording material containing a layer of selenium, arsenic and halogen, and thereabove a layer of selenium and tellurium | Hartmut Dulken, Karlheinz Kassel, Hubert Walsdorfer | 1985-04-23 |