Process for preparing a powder of material of natural origin
US12351691B2 · kind B2 · utility
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17Claims
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Key dates
| Filing date | Feb 3, 2021 |
| Grant date | Jul 8, 2025 |
| Priority date | — |
| Expiry date | Nov 19, 2041 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08J2489/06
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A process for preparing a powder of a material of natural origin, which includes a step of treating a substance containing at least 70% by weight of one or more leather wastes in particle form in a twin-screw extruder, wherein a temperature profile is applied that increases from an initial temperature of between 10 and 40° C. up to a maximum temperature of between 60 and 120° C., in the presence of water in an amount such that the weight ratio of water to substance is between 0.20 and 6.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.