Issued Patents All Time
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 5554685 | Method of making a sign having raised characters | Wayne L. Dorpfeld, Robert W. Williams | 1996-09-10 |
| 5504144 | Composition of matter for raised characters and method for manufacturing raised characters for use in signs | Wayne L. Dorpfeld, Robert W. Williams | 1996-04-02 |
| 5449240 | Apparatus for embossing Braille labels | Wayne L. Dorpfeld, Robert W. Williams | 1995-09-12 |