Patent US2988488A successfully refreshed from Google Patents.
US2988488A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzymatic dehairing of hides and skins
Assignee: Mearl Corp
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Filing: 1958-04-11
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Granted: 1961-06-13
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Expires: 1978-04-11
Abstract
No abstract record available.
Inventors
- 👤 Robert S Robison
- 👤 Walter J Nickerson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 16:26
CPC Classifications
C; C14; C14C; C14C1/00; C14C1/06; C14C1/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
183 words
THE METHOD FOR DEHAIRING HIDES AND SKINS AND PREPARING THE SAME FOR TANNING, WHICH COMPRISES IMMERSING SAID HIDES AND SKINS, WITHOUT PRIOR TREATMENT THEREOF EFFECTIVE TO DEGRADE THE KERATIN PROTEIN THEREIN, IN AN AQUEOUS SOLUTION CONTAINING A PROTEOLYTIC ENZYME EFFECTIVE TO DIGEST A SUBSTANTIAL AMOUNT OF KERATINACEOUS MATERIAL INCLUDING THE TRYPSIN-DIGESTIBLE PROTEIN OF SAID MATERIAL AND A SUBSTANTIAL AMOUNT OF THE KERATIN PROTEIN OF SAID MATERIAL THAT IS INDIGESTIBLE BY TRYPSIN, SAID PROTEOLYTIC ENZYME BEING CHARACTERIZED (A) BY BEING WATER SOLUBLE, (B) BY BEING NON-DIALYZABLE, (C) BY HAVING ITS KERATIN-DIGESTIVE-ABILITY DESTROYED BY HEATING TO ABOUT 100*C. FOR FIVE MINUTES, (B) BY HAVING ITS MAXIMUM KERATIN-DIGESTIVE-ABILITY AT A PH IN THE RANGE OF ABOUT 8.5 TO 9.5, (E) BY BEING PRECIPITABLE FROM AN AQUEOUS SOLUTION THEREOF BY THE ADDITION OF AMMONIUM SULPHATE, AND (F) HAVING ITS KERATIN-DIGESTIVE-ABILITY DEPENDENT ON THE PRESENCE OF AT LEAST TRACE AMOUNTS OF CHELATABLE METAL IONS, SAID SOLUTION HAVING A KERATINASE ACTIVITY BETWEEN 20 AND 600 KERATINASE UNITS PER ML., AND AGITATING SAID HIDES AND SKINS IN SAID SOLUTION, THEREBY EFFECTING DEHAIRING OF SAID HIDES AND SKINS IN SAID SOLUTION.
Claim 2
Independent Claim
183 words
THE METHOD FOR DEHAIRING HIDES AND SKINS AND PREPARING THE SAME FOR TANNING, WHICH COMPRISES IMMERSING SAID HIDES AND SKINS, WITHOUT PRIOR TREATMENT THEREOF EFFECTIVE TO DEGRADE THE KERATIN PROTEIN THEREIN, IN AN AQUEOUS SOLUTION CONTAINING A PROTEOLYTIC ENZYME EFFECTIVE TO DIGEST A SUBSTANTIAL AMOUNT OF KERATINACEOUS MATERIAL INCLUDING THE TRYPSIN-DIGESTIBLE PROTEIN OF SAID MATERIAL AND A SUBSTANTIAL AMOUNT OF THE KERATIN PROTEIN OF SAID MATERIAL THAT IS INDIGESTIBLE BY TRYPSIN, SAID PROTEOLYTIC ENZYME BEING CHARACTERIZED (A) BY BEING WATER SOLUBLE, (B) BY BEING NON-DIALYZABLE, (C) BY HAVING ITS KERATIN-DIGESTIVE-ABILITY DESTROYED BY HEATING TO ABOUT 100*C. FOR FIVE MINUTES, (B) BY HAVING ITS MAXIMUM KERATIN-DIGESTIVE-ABILITY AT A PH IN THE RANGE OF ABOUT 8.5 TO 9.5, (E) BY BEING PRECIPITABLE FROM AN AQUEOUS SOLUTION THEREOF BY THE ADDITION OF AMMONIUM SULPHATE, AND (F) HAVING ITS KERATIN-DIGESTIVE-ABILITY DEPENDENT ON THE PRESENCE OF AT LEAST TRACE AMOUNTS OF CHELATABLE METAL IONS, SAID SOLUTION HAVING A KERATINASE ACTIVITY BETWEEN 20 AND 600 KERATINASE UNITS PER ML., AND AGITATING SAID HIDES AND SKINS IN SAID SOLUTION, THEREBY EFFECTING DEHAIRING OF SAID HIDES AND SKINS IN SAID SOLUTION.
References Cited (Backward Citations)
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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) | 1964-06-12 | 1964-12-12 | 1965-06-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-12 | 1968-12-12 | 1969-06-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-12 | 1972-12-12 | 1973-06-13 | $7700.00 | Window Closed / Lapsed |