US4019956A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for recovering hair by dissolving the skin or hide
Assignee: Omnium de Prospective Industrielle SA
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Filing: 1975-07-22
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Granted: 1977-04-26
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Expires: 1995-07-22
Abstract
Abstract The invention relates to a process permitting the dissolving of the skin or hide and the recovery of the hair. After rehydrating and scouring the skins or hides are plumped and predegraded at an alkaline pH and then dissolved by enzymatic action. The hair obtained is in a satisfactory condition and can be subsequently utilized.
Inventors
- 👤 Carnot E. A. R. Saby
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:44
CPC Classifications
C; C14; C14C; C14C1/00; C14C1/06; C14C1/065
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
139 words
In a process for recovery of hair by dissolving the epidermal layers of animal skins or hides in a solution of bacterial protease, wherein said skins or hides are first rehydrated in water and thereafter scoured in an aqueous solution, the improvement comprising: (a) predigesting and plumping the rehydrated and scoured skins in a bath containing an effective amount of sodium perborate and 1 to 10% by weight urea based upon the weight of dried skins or hides at a pH of 8 to 10 for sufficient time to predigest and plump said rehydrated and scoured skins; (b) adding 0.5 to 5% by weight of a bacterial protease based upon said weight of dried skins or hides to said bath to complete the digestion of the epidermal layer and to separate hair therefrom; and (c) recovering the separated hair.
Claim 2
Dependent Claim
139 words
In a process for recovery of hair by dissolving the epidermal layers of animal skins or hides in a solution of bacterial protease, wherein said skins or hides are first rehydrated in water and thereafter scoured in an aqueous solution, the improvement comprising: (a) predigesting and plumping the rehydrated and scoured skins in a bath containing an effective amount of sodium perborate and 1 to 10% by weight urea based upon the weight of dried skins or hides at a pH of 8 to 10 for sufficient time to predigest and plump said rehydrated and scoured skins; (b) adding 0.5 to 5% by weight of a bacterial protease based upon said weight of dried skins or hides to said bath to complete the digestion of the epidermal layer and to separate hair therefrom; and (c) recovering the separated hair.
Claim 3
Dependent Claim
21 words
A process according to claim 1, wherein the bath contains about 5% of urea per kg of dried skin or hide.
Claim 4
Dependent Claim
19 words
A process according to claim 1, wherein about 2% of bacterial protease per kg of dried skin is added.
Claim 5
Dependent Claim
21 words
A process according to claim 1, wherein bacterial protease is added after the bath has reacted for at least 4 hours.
Claim 6
Dependent Claim
13 words
A process according to claim 1, wherein the bath contains a wetting agent.
Claim 7
Dependent Claim
16 words
A process according to claim 1, wherein the bath contains at least one alkali metal halide.
Claim 8
Dependent Claim
19 words
A process according to claim 6, wherein the bath contains between about 1 and 10% of alkali metal halide.
Claim 9
Dependent Claim
14 words
A process according to claim 6, wherein the alkali metal halide is sodium chloride.
Claim 10
Dependent Claim
16 words
A process according to claim 1, wherein the bath contains at least one alkaline-earth metal halide.
Claim 11
Dependent Claim
18 words
A process according to claim 9, wherein the bath contains between 1 and 10% of alkaline-earth metal halide.
Claim 12
Dependent Claim
14 words
A process according to claim 9, wherein the alkaline-earth metal halide is calcium chloride.
References Cited (Backward Citations)
US2363646A
Cited
US3076749A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-04-25 | 1980-10-25 | 1981-04-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-04-25 | 1984-10-25 | 1985-04-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-04-25 | 1988-10-25 | 1989-04-26 | $7700.00 | Window Closed / Lapsed |