Patent US3843997A successfully refreshed from Google Patents.
US3843997A
Expired / Lapsed
US
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Process for obtaining corium from bovine hide
Assignee: Viskase Ltd
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Filing: 1973-03-02
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Granted: 1974-10-29
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Expires: 1993-03-02
Abstract
Abstract Corium, suitable for processing into edible food casings, is obtained from fresh, unsalted bovine hide by a process involving cooling the hide to 15* C. or below by washing, de-hairing the cooled hide with a lime solution of pH 12.6 or less and temperature not exceeding 15* C., washing the limed hide, defleshing, and finally removing the epidermal layer together with all hair follicles.
Inventors
- 👤 T Treharne
- 👤 D Tuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 03:47
CPC Classifications
C; C14; C14C; C14C1/00; C14C1/06; A; A22; A22C; A22C13/00; A22C13/0013; A22C13/0016
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
81 words
A PROCESS FOR OBTAINING CORIUM FROM BOVINE HIDE, WHICH COMPRISES WASHING FRESH UNSALTED BOVINE HIDE TO REDUCE THE HIDE TEMPERATURE TO 15*C. OR BELOW, DE-HAIRING THE COOLED HIDE BY CONTACTING IT WITH A LIME SOLUTION HAVING A PH NOT EXCEEDING 12.6 AND A TEMPERATURE NOT EXCEEDING 15*C., WASHING THE LIMED HIDE, DE-FLESHING THE HIDE, AND OBTAINING CORIUM FROM THE DE-FLESHED HIDE BY REMOVING FROM SAID DE-FLESHED HIDE THE EPIDERMAL LAYER TOGETHER WITH SUBSTANTIALLY ALL HAIR FOLLICLES, THEREBY LEAVING CORIUM AS RESIDUE.
Claim 2
Dependent Claim
81 words
A PROCESS FOR OBTAINING CORIUM FROM BOVINE HIDE, WHICH COMPRISES WASHING FRESH UNSALTED BOVINE HIDE TO REDUCE THE HIDE TEMPERATURE TO 15*C. OR BELOW, DE-HAIRING THE COOLED HIDE BY CONTACTING IT WITH A LIME SOLUTION HAVING A PH NOT EXCEEDING 12.6 AND A TEMPERATURE NOT EXCEEDING 15*C., WASHING THE LIMED HIDE, DE-FLESHING THE HIDE, AND OBTAINING CORIUM FROM THE DE-FLESHED HIDE BY REMOVING FROM SAID DE-FLESHED HIDE THE EPIDERMAL LAYER TOGETHER WITH SUBSTANTIALLY ALL HAIR FOLLICLES, THEREBY LEAVING CORIUM AS RESIDUE.
Claim 3
Dependent Claim
23 words
A process as claimed in claim 1 wherein, prior to the de-hairing operation, the hide temperature is reduced to 11* C. or below.
Claim 4
Dependent Claim
18 words
A process as claimed in claim 1, wherein the pH of the liming solution does not exceed 12.2.
Claim 5
Dependent Claim
17 words
A process as claimed in claim 1, wherein the pH of the liming solution is approximately 11.6.
Claim 6
Dependent Claim
14 words
A process as claimed in claim 1, wherein the liming solution includes sodium hydrosulphide.
Claim 7
Dependent Claim
20 words
A process as claimed in claim 5, wherein the liming solution includes approximately 1 percent by weight of sodium hydrosulphide.
Claim 8
Dependent Claim
16 words
A process as claimed in claim 1, wherein the liming solution contains substantially no sodium sulphide.
Claim 9
Dependent Claim
25 words
A process as claimed in claim 1, wherein the hide remains in contact with the liming solution for a period of at least 10 hours.
Claim 10
Dependent Claim
24 words
A process as claimed in claim 1, wherein the liming solution/hide mixture is agitated intermittently or continuously in the course of the de-hairing operation.
Claim 11
Dependent Claim
22 words
A process as claimed in claim 1, wherein removal of the epidermal layer and hair follicles is effected by a splitting operation.
Claim 12
Dependent Claim
23 words
A process as claimed in claim 10, wherein the splitting operation is effected by means of a band knife or a rotary knife.
Claim 13
Dependent Claim
31 words
A process as claimed in claim 1, wherein in the course of removing the epidermal layer, the upper layer of the de-fleshed hide is removed to a depth of 2.5 mm.
Claim 14
Dependent Claim
20 words
A process as claimed in claim 1, wherein removal of the epidermal layer and hair follicles is effected by scraping.
Claim 15
Dependent Claim
16 words
A process as claimed in claim 1, wherein the separated epidermal layer is processed into leather.
Claim 16
Dependent Claim
25 words
A process as claimed in claim 1, wherein the steps required to obtain corium are completed within 24 hours of the death of the animal.
Claim 17
Dependent Claim
22 words
A process as claimed in claim 15, wherein the said steps are completed within 18 hours of the death of the animal.
Claim 18
Dependent Claim
22 words
A process as claimed in claim 1, which is carried out on hide obtained from animals 1 1/2 to 2 years old.
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) | 1977-10-28 | 1978-04-29 | 1978-10-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-28 | 1982-04-29 | 1982-10-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-28 | 1986-04-29 | 1986-10-29 | $7700.00 | Window Closed / Lapsed |