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| US4604312 | 11 juin 1984 | 5 août 1986 | Armstrong World Industries, Inc. | Stress-free, embossed, ornamented tile surface covering and process for making the same |
| US4670075 | 5 nov. 1984 | 2 juin 1987 | Firma Carl Freudenberg | Method of manufacturing light-colored electrically-conductive floor covering |
| US4778547 | 20 janv. 1987 | 18 oct. 1988 | Armstrong World Industries, Inc. | Process for making a dimensionally stable, embossed, ornamented tile surface covering |
| US5049431 | 22 déc. 1986 | 17 sept. 1991 | Firma Carl Freudenberg | Multi-colored floor covering and method of manufacturing it |
| US5944197 | 24 avr. 1997 | 31 août 1999 | Southwestern Wire Cloth, Inc. | Rectangular opening woven screen mesh for filtering solid particles |
