US3623950A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Enzymatic dehairing process
Assignee: Roehm GmbH Darmstadt
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Filing: 1969-04-10
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Granted: 1971-11-30
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Expires: 1989-04-10
Abstract
Abstract Process for dehairing skins and hides by treatment thereof, at a pH less than 5, with a mold-fungus protease showing its optimum effect at a pH below 5, with pepsin, with papain, or with a combination of these enzymes.
Inventors
- 👤 Rolf Monsheimer
- 👤 Ernst Pfleiderer
- 👤 Helmut Uhlig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:43
CPC Classifications
C; C14; C14C; C14C1/00; C14C1/06; C14C1/065
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
22 words
A process as in claim 1 wherein said skins and hides are treated at a pH between about 3 and about 5.
Claim 2
Dependent Claim
11 words
A process as in claim 1 wherein said enzyme is pepsin.
Claim 3
Dependent Claim
11 words
A process as in claim 1 wherein said enzyme is papain.
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) | 1974-11-29 | 1975-05-31 | 1975-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-29 | 1979-05-31 | 1979-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-29 | 1983-05-31 | 1983-11-30 | $7700.00 | Window Closed / Lapsed |