| Number | Name | Date | Kind |
|---|---|---|---|
| 2993590 | Denton | Jul 1961 | |
| 3111220 | Bostrom | Nov 1963 | |
| 3635331 | Zucker | Jan 1972 | |
| 3666087 | Cooper | May 1972 | |
| 4456124 | Kay et al. | Jun 1984 | |
| 4694960 | Phipps et al. | Sep 1987 | |
| 4784268 | Perchak | Nov 1988 | |
| 4899882 | Benner | Feb 1990 | |
| 5209354 | Thornhill et al. | May 1993 | |
| 5456382 | Gringer | Oct 1995 | |
| 5699913 | Richardson | Dec 1997 | |
| 5899333 | Williams et al. | May 1999 |
| Entry |
|---|
| Techform, Inc. 20 Years of Creative Custom Thermoforming, brochure, Nov. 1982. |