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| US4074959 | 30 Sep 1976 | 21 Feb 1978 | Karl Kroyer St. Anne's Limited | Apparatus for forming multi-ply fibrous sheets |
| US4123212 | 27 Jun 1977 | 31 Oct 1978 | Maso-Therm Corporation | Apparatus for uniformly distributing glass fibers |
| US4207043 | 22 Jun 1977 | 10 Jun 1980 | Defibrator Fiberboard AB | Apparatus for producing fiberboard according to the dry method |
| US5041178 | 13 Ene 1989 | 20 Ago 1991 | Manville Corporation | Method of manufacturing a fibrous board |
