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| US4442686 | 3 May 1982 | 17 Abr 1984 | Firma Carl Freudenberg | Support tubes for cross-wound coils and cross-windings |
| US5056733 | 1 May 1990 | 15 Oct 1991 | Sonoco Products Company | Tubular yarn carrier having improved nose construction |
| US5120294 | 11 Jun 1991 | 9 Jun 1992 | Sonoco Products Company | Method and apparatus for forming a tubular yarn carrier |
| US5211354 | 3 Jun 1992 | 18 May 1993 | Sonoco Products Company | Textile core having improved start up groove |
| US5328121 | 28 Ene 1993 | 12 Jul 1994 | Sonoco Products Company | Textile core having improved start-up groove |
| US5441208 | 20 May 1993 | 15 Ago 1995 | Sonoco Products Company | Textile core having transfer tail engagement |
| US5495087 | 28 Mar 1994 | 27 Feb 1996 | Sonoco Products Company | Grooving blade for textile core |
