| 9683327 | Cutting and double-face leather integrated dyeing process for tan sheep skin | Nov 07, 14 | Jun 20, 17 | Ningxia Wuzhong Jingyi Fur-Products Co., LTD. |
| 8801804 | Non-metal tanning process | Oct 05, 11 | Aug 12, 14 | STAHL INTERNATIONAL BV |
| 8795389 | Non metal tanning | Oct 05, 11 | Aug 05, 14 | STAHL INTERNATIONAL BV |
| 8795390 | Non metal tanning | Oct 25, 11 | Aug 05, 14 | STAHL INTERNATIONAL BV |
| 8790416 | Non-metal tanning process | Oct 05, 11 | Jul 29, 14 | STAHL INTERNATIONAL BV |
| 7252687 | Process for making wet-pink leather | Dec 23, 04 | Aug 07, 07 | COUNCIL OF SCIENTIFIC AND INDUSTRIAL RESEARCH |
| 5501709 | Economy and plumping chrome tanning | Aug 12, 93 | Mar 26, 96 | Hoechst Aktiengesellschaft |
| 5500020 | Process for titanium-based mixed tannings | May 23, 95 | Mar 19, 96 | COLOROBBIA ITALIA S.P.A. |
| 5409501 | Dilutable aluminum triformate tanning agents in the form of highly concentrated, storable aqueous solutions and their use | Mar 14, 94 | Apr 25, 95 | COGNIS IP MANAGEMENT GMBH |
| 5326377 | Method of treating hides | Apr 30, 92 | Jul 05, 94 | AGA AB |
| 5098446 | Use of fluorochemicals in leather manufacture | Oct 13, 89 | Mar 24, 92 | Minnesota Mining and Manufacturing Company |
| 5002584 | Seasoning agents for leathers and leatherlike materials | Nov 15, 88 | Mar 26, 91 | Bayer Aktiengesellschaft |
| 4999024 | Leather tanning process | Jul 09, 90 | Mar 12, 91 | Not available |
| 4978361 | Economy chrome tanning | Apr 25, 89 | Dec 18, 90 | Hoechst Aktiengesellschaft |
| 4963156 | Tanning agent and process | Feb 02, 89 | Oct 16, 90 | Tioxide Group PLC |
| 4960429 | Chromium free process for the tanning of hides | Mar 09, 89 | Oct 02, 90 | HISPANO QUIMICA S.A. |
| 4936864 | Condensates of bis-(4-hydroxyphenyl) sulfone as tanning assistants, their preparation and use in the tanning of leather | Sep 20, 88 | Jun 26, 90 | BASF AKTIENGESELLSCHAFT |
| 4731089 | Leather tanning process using aluminium (III) and titanium (IV) complexes | Oct 16, 85 | Mar 15, 88 | Tioxide Group PLC |
| 4504271 | Leather tanning agent and process for making same | Jan 18, 83 | Mar 12, 85 | Not available |
| 4502859 | Hide tanning composition and method of preparing same | Apr 11, 83 | Mar 05, 85 | Rockmont Industries, Inc. |