US3549304A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Leather dyeing and coating with a resin dye copolymer of an n-methylolacrylamide and an alkyl acrylate
Assignee: BASF SE
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Filing: 1968-04-24
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Granted: 1970-12-22
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Expires: 1988-04-24
Abstract
No abstract record available.
Inventors
- 👤 Friedrich Ebel
- 👤 Klaus Gulbins
- 👤 Erwin Hahn
- 👤 Guenter Lange
- 👤 Rudolf Schubert
- 👤 Hans Wilhelm
- 👤 Hans Wolf
- 👤 Lothar Wuertele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 12:02
CPC Classifications
D; D06; D06P; D06P3/00; D06P3/02; D06P3/04; D06P3/32; D06P3/3266; D06P3/3206
Claims Analysis
Total Claims: 0
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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) | 1973-12-21 | 1974-06-22 | 1974-12-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-21 | 1978-06-22 | 1978-12-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-21 | 1982-06-22 | 1982-12-22 | $7700.00 | Window Closed / Lapsed |