Issued Patents 1989
Showing 1–3 of 3 patents
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4866097 | Controlled release system | Alfred J. Arch | 1989-09-12 |
| 4851225 | Material dispensers | Alfred J. Arch | 1989-07-25 |
| 4849001 | Method for making sintered glass | Alfred J. Arch, Mary Tripp | 1989-07-18 |