US2521582A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of keratinaceous materials
Assignee: Armour and Co
•
Filing: 1944-11-27
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Granted: 1950-09-05
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Expires: 1964-11-27
Abstract
No abstract record available.
Inventors
- 👤 Havard L Keil
- 👤 Ingraham Joseph Sterling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:48
CPC Classifications
A; A62; A62D; A62D1/00; A62D1/0071; A62D1/0078
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
91 words
A PROCESS FOR THE TREATMENT OF THE PROTEINS OF HOOFS, COMPRISING HEATING THE PROTEIN-BEARING MATERIAL UNDER PRESSURE AT A TEMPERATURE GENERALLY ABOUT 130*C FOR A SUFFICIENT PERIOD TO CAUSE THE MATERIAL TO SWELL AND TAKE UP WATER, GRINDING THE MATERIAL, HEATING THE MATERIAL IN AN AQUEOUS ALKALINE MEDIUM, ACIDIFYING THE MIXTURE TO BRING THE PH TO ABOUT 6.5, HEATING THE ACIDIFIED MIXTURE TO LIBERATE HYDROGEN SULFIDE THEREFROM, AND TREATING THE MIXTURE WITH A HYDROLYZING PROTEOLYTIC ENZYME UNDER CONDITIONS OF TEMPEATURE AND HYDROGEN ION CONCENTRATION FAVORABLE TO THE ACTIVITY OF THE ENZYME.
Claim 2
Dependent Claim
91 words
A PROCESS FOR THE TREATMENT OF THE PROTEINS OF HOOFS, COMPRISING HEATING THE PROTEIN-BEARING MATERIAL UNDER PRESSURE AT A TEMPERATURE GENERALLY ABOUT 130*C FOR A SUFFICIENT PERIOD TO CAUSE THE MATERIAL TO SWELL AND TAKE UP WATER, GRINDING THE MATERIAL, HEATING THE MATERIAL IN AN AQUEOUS ALKALINE MEDIUM, ACIDIFYING THE MIXTURE TO BRING THE PH TO ABOUT 6.5, HEATING THE ACIDIFIED MIXTURE TO LIBERATE HYDROGEN SULFIDE THEREFROM, AND TREATING THE MIXTURE WITH A HYDROLYZING PROTEOLYTIC ENZYME UNDER CONDITIONS OF TEMPEATURE AND HYDROGEN ION CONCENTRATION FAVORABLE TO THE ACTIVITY OF THE ENZYME.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |