Issued Patents All Time
Showing 1–2 of 2 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4703573 | Visual and audible activated work and method of forming same | John Montgomery, Alfred E. Hall, John L. Sigalos | 1987-11-03 |
| 4656469 | Activated work and method of forming same | Alfred E. Hall, John L. Sigalos | 1987-04-07 |