Issued Patents All Time
| Patent # | Title | Co-Inventors | Date |
|---|---|---|---|
| 4644623 | Method of making a rotatable molding element for selectively aperturing thermoplastic film | Dean M. Spear | 1987-02-24 |
| 4636161 | Screen for selectively perforating thermoplastic film | Dean M. Spear | 1987-01-13 |
| 4604156 | Method of fabricating a cylindrical multilayer screen | Dean M. Spear | 1986-08-05 |
| 4585156 | Screen fabrication | Dean M. Spear | 1986-04-29 |
| 4550546 | Sterilizable perforated packaging material | Richard W. Goodrum | 1985-11-05 |
| 4543299 | Laminated, seamless, cylindrical metal screen for vacuum perforation of thermoplastic film | Dean M. Spear | 1985-09-24 |
| 4541794 | Apparatus for producing perforated plastic film | Dean M. Spear | 1985-09-17 |
| 4535020 | Perforated film | Paul E. Thomas | 1985-08-13 |
| 4456570 | Treatment of perforated film | Paul E. Thomas | 1984-06-26 |
| D268962 | Thermoplastic film stock | James M. Adams | 1983-05-10 |
| 4351784 | Corona treatment of perforated film | Paul E. Thomas | 1982-09-28 |
| 4317792 | Process for producing perforated film | James M. Adams | 1982-03-02 |
| 4252516 | Apparatus for producing perforated film | James M. Adams | 1981-02-24 |
| 4203715 | Rotating joint for extrusion die | C. W. Miller, D. Lamont Smith | 1980-05-20 |