Tanning leather
US6540790B2 · kind B2 · utility
1Cited by
3References
22Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 14, 2000 |
| Grant date | Apr 1, 2003 |
| Priority date | — |
| Expiry date | Apr 14, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC14C3/02
- WIPO fieldChemical engineering
- WIPO sectorChemistry
Abstract
Leather is tanned by cross-linking collagen with tris(hydroxymethyl)phosphine or a condensate of a tetrakis(hydroxymethyl)phosphonium salt with an amide or amine in a main tannage or retannage.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.