US2535684A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Recovery of protein from
Assignee: —
•
Filing: —
•
Granted: 1950-12-26
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Expires: 1967-12-26
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:29
CPC Classifications
A; A61; A61K; A61K38/00; A61K38/01; A61K38/012; A61K38/014; A61K38/015; A61K8/00; A61K8/18; A61K8/19; A61K8/23; A61K8/30; A61K8/64; A61K8/65; A61Q; A61Q19/00; A61Q5/00; A61Q7/00; C; C07; C07K; C07K14/00; C07K14/435; C07K14/46; C07K14/47; C07K14/4701; C07K14/4741
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN THE RECOVERY OF PROTEIN FROM KERATINOUS MATERIALS THE IMPROVEMENT WHICH COMPRISES SUBJECTING A KERATINOUS MATERIAL, ACID PRE-TREATED FOR NA2S CYSTINE REDUCTION, TO THE ACTION OF AN AQUEOUS SOLUTION, CONTAINING PER DRY WEIGHT OF KERATINOUS MATERIAL PRESENT ABOUT 3-5% NA2S AND ABOUT 3-6% NA2S204 AT A PH OF ABOUT 9 TO 10 AND AT A TEMPERATURE OF LESS THAN 60*C., THE AMOUNT OF AQUEOUS MEDIUM BEING SUFFICIENT TO SUBSTANTIALLY COVER THE KERATINOUS MATERIAL PRESENT AND THE COMBINES NA2S-NA2S204 CONCENTRATION IN SAID MEDIUM BEING SUFFICIENT FOR CYSTINE REDUCTION OF SAID KERATINOUS MATERIAL, MAINTAINING THE REACTION MASS AT SAID PH AND AT SAID TEMPERATURE UNTIL THE KERATINOUS MATERIAL IS SUBSTANTIALLY DISSOLVED AND RECOVERING PROTEIN FROM SAID SOLUTION.
Claim 2
Dependent Claim
115 words
IN THE RECOVERY OF PROTEIN FROM KERATINOUS MATERIALS THE IMPROVEMENT WHICH COMPRISES SUBJECTING A KERATINOUS MATERIAL, ACID PRE-TREATED FOR NA2S CYSTINE REDUCTION, TO THE ACTION OF AN AQUEOUS SOLUTION, CONTAINING PER DRY WEIGHT OF KERATINOUS MATERIAL PRESENT ABOUT 3-5% NA2S AND ABOUT 3-6% NA2S204 AT A PH OF ABOUT 9 TO 10 AND AT A TEMPERATURE OF LESS THAN 60*C., THE AMOUNT OF AQUEOUS MEDIUM BEING SUFFICIENT TO SUBSTANTIALLY COVER THE KERATINOUS MATERIAL PRESENT AND THE COMBINES NA2S-NA2S204 CONCENTRATION IN SAID MEDIUM BEING SUFFICIENT FOR CYSTINE REDUCTION OF SAID KERATINOUS MATERIAL, MAINTAINING THE REACTION MASS AT SAID PH AND AT SAID TEMPERATURE UNTIL THE KERATINOUS MATERIAL IS SUBSTANTIALLY DISSOLVED AND RECOVERING PROTEIN FROM SAID SOLUTION.
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) | 1953-12-25 | 1954-06-26 | 1954-12-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-25 | 1958-06-26 | 1958-12-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-25 | 1962-06-26 | 1962-12-26 | $7700.00 | Window Closed / Lapsed |