US2746837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of leather using a modified vinyl ether-maleic anhydride copolymer, and resulting product
Assignee: GAF Chemicals Corp
•
Filing: 1951-12-28
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Granted: 1956-05-22
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Expires: 1971-12-28
Abstract
No abstract record available.
Inventors
- 👤 Joseph S Kirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:42
CPC Classifications
C; C14; C14C; C14C3/00; C14C3/02; C14C3/08; C14C3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
54 words
A PROCESS COMPRISING TREATING HIDES, SKINS AND LEATHER WITH A LOWER ALKYL VINYL ETHER-MALEIC ANHYDRIDE COPOLYMER IN WHICH AT LEAST ABOUT 5 AND NO MORE THAN 15% OF THE ANHYDRIDE GROUPS HAVE BEEN CONVERTED TO THE SALT-HALF AMIDE WITH A MEMBER OF THE GROUP CONSISTING OF AMMONIA AND LOWER ALIPHATIC PRIMARY AND SECONDARY AMINES.
Claim 2
Dependent Claim
54 words
A PROCESS COMPRISING TREATING HIDES, SKINS AND LEATHER WITH A LOWER ALKYL VINYL ETHER-MALEIC ANHYDRIDE COPOLYMER IN WHICH AT LEAST ABOUT 5 AND NO MORE THAN 15% OF THE ANHYDRIDE GROUPS HAVE BEEN CONVERTED TO THE SALT-HALF AMIDE WITH A MEMBER OF THE GROUP CONSISTING OF AMMONIA AND LOWER ALIPHATIC PRIMARY AND SECONDARY AMINES.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-22 | 1959-11-21 | 1960-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-22 | 1963-11-21 | 1964-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-22 | 1967-11-21 | 1968-05-22 | $7700.00 | Window Closed / Lapsed |