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Patent US3677813A successfully refreshed from Google Patents.
US3677813A
Expired / Lapsed
US
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Process for dressing leather and the dressed leather
Assignee: BASF SE
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Filing: 1969-12-17
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Granted: 1972-07-18
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Expires: 1989-12-17
Abstract
Abstract PROCESS FOR DRESSING LEATHER AND SYNTHETIC LEATHER SUBSTITUTES BY APPLYING TO THE LEATHER A COMPOSITION COMPRISING (A) A COPOLYMER CARRYING ACETYL ACETATE GROUPS OR CYANO ACETATE GROUPS, IN THE FORM OF A SOLUTION OR DISPERSION IN AN ORGANIC LIQUID, AND (B) ONE OR MORE ALDEHYDES OR A COMPOUND CAPABLE OF DISSOCIATING TO GIVE AN ALKEHYDE, AND DRYING THE COATING. THE RESULTING DRESSING IS WATERPROOF AND RESISTANT TO SOLVENTS.
Inventors
- 👤 Guenter Eckert
- 👤 Matthias Marx
- 👤 Heinrich Hartmann
- 👤 Lothar Wuertele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 18:23
CPC Classifications
D; D06; D06N; D06N3/00; D06N3/04; D06N3/042; C; C14; C14C; C14C11/00; C14C11/003; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31855; Y10T428/31942
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-18 | 1976-01-17 | 1976-07-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-18 | 1980-01-17 | 1980-07-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-18 | 1984-01-17 | 1984-07-18 | $7700.00 | Window Closed / Lapsed |