US2857316A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzymatic unhairing and dewooling process
Assignee: Roehm GmbH Darmstadt
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Filing: 1955-09-08
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Granted: 1958-10-21
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Expires: 1975-09-08
Abstract
No abstract record available.
Inventors
- 👤 Grimm Otto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:40
CPC Classifications
C; C14; C14C; C14C1/00; C14C1/06; C14C1/065
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
37 words
A METHOD OF UNHAIRING SKINS AND HIDES WHICH COMPRISES APPLYING PROTEOLYTIC ENZYME, IN POWDER FORM, TO A HIDE, PERMITTING ENZYMATIC ACTION TO TAKE PLACE AT AMBIENT TEMPERATURE WITHOUT IMMERSION IN WATER, AND THEREAFTER UNHAIRING THE TREATED HIDE.
Claim 2
Independent Claim
37 words
A METHOD OF UNHAIRING SKINS AND HIDES WHICH COMPRISES APPLYING PROTEOLYTIC ENZYME, IN POWDER FORM, TO A HIDE, PERMITTING ENZYMATIC ACTION TO TAKE PLACE AT AMBIENT TEMPERATURE WITHOUT IMMERSION IN WATER, AND THEREAFTER UNHAIRING THE TREATED HIDE.
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) | 1961-10-20 | 1962-04-21 | 1962-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-10-20 | 1966-04-21 | 1966-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-10-20 | 1970-04-21 | 1970-10-21 | $7700.00 | Window Closed / Lapsed |