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| US4214646 | 19 Jun 1978 | 29 Jul 1980 | Conwed Corporation | Space divider and acoustic panel | | US5104700 | 2 Jul 1986 | 14 Abr 1992 | | Fire protective device | | US5164260 | 19 Dic 1989 | 17 Nov 1992 | Matsushita Electric Industrial Co Ltd | Soundproofing materials | | US5318837 | 17 Dic 1991 | 7 Jun 1994 | Matsushita Electric Industrial Co., Ltd. | Soundproofing materials |
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