US2809088A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of retanning leather with a condensation product of sulfones of monohydric phenols, non-aromatic amines and formaldehyde
Assignee: Bayer AG
•
Filing: 1953-07-07
•
Granted: 1957-10-08
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Expires: 1973-07-07
Abstract
No abstract record available.
Inventors
- 👤 Meister Martin
- 👤 Mauthe Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 23:05
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
39 words
RETANNING PROCESS WHICH COMPRISES TETANNING A PREVIOUSLY TANNED LEATHER WITH A TANNING LIQUOR CONTAINING UP TO 25% OF A SALT OF A CONDENSATION PRODUCT OBTAINED FROM SULFONES OF MANOHYDRIC PHENOLS WITH NON-AROMATIC MONOAMINES AND FORMALDEHYDE AT TEMPERATURES ABOUT 100*C.
Claim 2
Dependent Claim
39 words
RETANNING PROCESS WHICH COMPRISES TETANNING A PREVIOUSLY TANNED LEATHER WITH A TANNING LIQUOR CONTAINING UP TO 25% OF A SALT OF A CONDENSATION PRODUCT OBTAINED FROM SULFONES OF MANOHYDRIC PHENOLS WITH NON-AROMATIC MONOAMINES AND FORMALDEHYDE AT TEMPERATURES ABOUT 100*C.
References Cited (Backward Citations)
US2129553A
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US1972754A
Cited
US2127068A
Cited
US2271245A
Cited
US2191943A
Cited
GB615190A
Cited
US2546946A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-07 | 1961-04-08 | 1961-10-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-07 | 1965-04-08 | 1965-10-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-07 | 1969-04-08 | 1969-10-08 | $7700.00 | Window Closed / Lapsed |