Patent US3254937A successfully refreshed from Google Patents.
US3254937A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry chrome pretannage and dry syntan or vegetable tannage
Assignee: Bayer AG
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Filing: 1962-07-25
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Granted: 1966-06-07
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Expires: 1982-07-25
Abstract
No abstract record available.
Inventors
- 👤 Komarek Ernst
- 👤 Mauthe Gustav
- 👤 Zinz Bruno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:35
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A PROCESS FOR TANNING VEGETABLE LEATHER CONSISTING ESSENTIALLY OF PRETANNING HIDE FROM THE LIME HOUSE BY APPLYING DIRECTLY THERETO A DRY POWDERED CHROME-TANNING AGENT IN THE DRUM IN THE ABSENCE OF LIQUOR AND THEREAFTER FINALLY TANNING BY DRUMMING THE HIDE WITH AN EFFECTIVE AMOUNT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF (A) DRY SYNTHETIC TANNING AGENT AND (B) VEGETABLE POWDER EXTRACTS ONLY.
Claim 2
Dependent Claim
64 words
A PROCESS FOR TANNING VEGETABLE LEATHER CONSISTING ESSENTIALLY OF PRETANNING HIDE FROM THE LIME HOUSE BY APPLYING DIRECTLY THERETO A DRY POWDERED CHROME-TANNING AGENT IN THE DRUM IN THE ABSENCE OF LIQUOR AND THEREAFTER FINALLY TANNING BY DRUMMING THE HIDE WITH AN EFFECTIVE AMOUNT OF A MEMBER SELECTED FROM THE GROUP CONSISTING OF (A) DRY SYNTHETIC TANNING AGENT AND (B) VEGETABLE POWDER EXTRACTS ONLY.
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) | 1969-06-06 | 1969-12-06 | 1970-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-06-06 | 1973-12-06 | 1974-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-06-06 | 1977-12-06 | 1978-06-07 | $7700.00 | Window Closed / Lapsed |