|
| US3987600 | 10 Dic 1975 | 26 Oct 1976 | United States Gypsum Company | Fire resistant doors |
| US4081283 | 23 Feb 1976 | 28 Mar 1978 | PMCMA Research Group | Plaster molding composition |
| US4148660 | 19 Dic 1977 | 10 Abr 1979 | PMCMA Research Group | Plaster molding composition |
| US4213931 | 25 Abr 1978 | 22 Jul 1980 | | Process of manufacturing gypsum products |
| US4687694 | 13 Feb 1985 | 18 Ago 1987 | | Decorative tile |
| US4693924 | 14 Ago 1986 | 15 Sep 1987 | | Decorative tile |
| US4840688 | 1 Sep 1988 | 20 Jun 1989 | Pfleiderer Industrie GmbH & Co., KG | Method for the production of fibrous plaster boards |
| US4883621 | 9 Jul 1986 | 28 Nov 1989 | Hitachi, Ltd. | Method for forming cast article by slip casting |
