Patent US2957783A successfully refreshed from Google Patents.
US2957783A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of finishing leather
Assignee: BASF SE
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Filing: 1957-05-14
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Granted: 1960-10-25
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Expires: 1977-05-14
Abstract
No abstract record available.
Inventors
- 👤 Dachs Karl
- 👤 Wilhelm Hans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:16
CPC Classifications
C; C14; C14C; C14C11/00; C14C11/003; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
48 words
PROCESS WHICH COMPRISES FINISHING LEATHER WITH A SOFTENER-FREE SOLUTION IN A 1 TO 4 CARBON ATOM ALCOHOL, OF A POLYAMIDE OF WHICH 100 PARTS BY WEIGHT OF THE POLYAMIDE-FORMING STOCK CONTAIN THE FOLLOWING COMPONENTS: (A) 15 TO 85 PARTS BY WEIGHT OF A DICARBOXYLIC ACID OF THE FORMULA
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) | 1963-10-25 | 1964-04-25 | 1964-10-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-10-25 | 1968-04-25 | 1968-10-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-10-25 | 1972-04-25 | 1972-10-25 | $7700.00 | Window Closed / Lapsed |