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| US5700353 | 7 Jun 1995 | 23 Dic 1997 | Ranpak Corporation | Paper strengthened with solubilized collagen and method |
| US5700354 | 7 Jun 1995 | 23 Dic 1997 | Ranpak Corp. | Paper strengthened with solubilized collagen and method |
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| US5714042 | 7 Jun 1995 | 3 Feb 1998 | Ranpak Corporation | Paper strengthened with solubilized collagen and method |
| US5736010 | 7 Jun 1995 | 7 Abr 1998 | Ranpak Corporation | Paper strengthened with solubilized collagen and method |
| US5810970 | 7 Jun 1995 | 22 Sep 1998 | Ranpak Corporation | Paper strengthened with solubilized collagen and method |
