Patent US4169052A successfully refreshed from Google Patents.
US4169052A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for absorbing hydrocarbons or organic solvents
Assignee: IFP Energies nouvelles
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Filing: 1978-03-10
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Granted: 1979-09-25
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Expires: 1998-03-10
Abstract
Abstract Surfaces and media contaminated with fatty materials such as hydrocarbons, vegetable or animal oils or fats, organic solvents and other organic compounds may be cleaned by spreading thereon leather particles and/or fibers. A preferred embodiment comprises bringing leather wastes to a selected water content and crushing them to particles and/or fibers.
Inventors
- 👤 Christian Bocard
- 👤 Marc Folachier
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 04:59
CPC Classifications
B; B01; B01J; B01J20/00; B01J20/22; B01J20/24; B01D; B01D17/00; B01D17/02; B01D17/0202; C; C02; C02F; C02F1/00; C02F1/68; C02F1/681; C08; C08K; C08K3/00; C08K3/18; C08K3/20; C08K3/22; C09; C09K; C09K3/00; C09K3/32
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
67 words
A process for cleaning media or surfaces comprising oil or fat materials by absorption of said materials with an absorption mass, wherein the absorption mass comprises absorptive leather particles or fibers of size lower than 1 cm, as obtained from tanning animal skin and subsequently crushing the tanned skin, said leather particles having leather surfaces thereof in direct contact with said oil or fat materials during absorption.
Claim 2
Dependent Claim
67 words
A process for cleaning media or surfaces comprising oil or fat materials by absorption of said materials with an absorption mass, wherein the absorption mass comprises absorptive leather particles or fibers of size lower than 1 cm, as obtained from tanning animal skin and subsequently crushing the tanned skin, said leather particles having leather surfaces thereof in direct contact with said oil or fat materials during absorption.
Claim 3
Dependent Claim
36 words
A process according to claim 1, wherein the tanning agent is a vegetable tannin, an inorganic material selected from sulfur and chromium, aluminum, iron or zirconium salts, or an organic tanning material of a non-vegetable origin.
Claim 4
Dependent Claim
14 words
A process according to claim 2, wherein the tanning agent is a chromium salt.
Claim 5
Dependent Claim
31 words
A process according to claim 1, wherein the particles or fibers are obtained by drying wet-blue leather wastes under mild conditions to 15-25% by weight water content prior to crushing same.
Claim 6
Dependent Claim
24 words
A process according to claim 4, wherein the absorption mass is a mixture of particles and fibers, whose fiber content is 10-30% by weight.
Claim 7
Dependent Claim
28 words
A process according to claim 1, wherein the particles or fibers are obtained by crushing tanned leather wastes previously brought to a water content of 15-25% by weight.
Claim 8
Dependent Claim
14 words
A process according to claim 6, wherein the water content is 15-20% by weight.
Claim 9
Dependent Claim
24 words
A process according to claim 1, wherein the absorption mass is a mixture of particles and fibers, whose fiber content is 10-30% by weight.
Claim 10
Dependent Claim
31 words
A process according to claim 1, wherein the absorption mass is a mixture of 70-99% by weight leather particles or fibers with a 1-30% by weight of water insoluble mineral powder.
Claim 11
Dependent Claim
25 words
A process according to claim 9, wherein the medium or surface to be cleaned is the ground, and the water-soluble mineral powder is calcium carbonate.
Claim 12
Dependent Claim
14 words
A process according to claim 9 containing 5-15% by weight of said mineral powder.
Claim 13
Dependent Claim
18 words
A process according to claim 1, wherein the medium or surface to be cleaned is a water surface.
Claim 14
Dependent Claim
20 words
A process according to claim 1, wherein the medium or surface to be cleaned is an aqueous emulsion discharge stream.
Claim 15
Dependent Claim
21 words
A process according to claim 13 wherein the aqueous emulsion discharge stream has been subjected to a preceding primary de-oiling step.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |