US2621169A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing ammonium salts of copolymer compositions
Assignee: Publicker Ind Inc
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Filing: 1948-12-18
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Granted: 1952-12-09
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Expires: 1968-12-18
Abstract
No abstract record available.
Inventors
- 👤 Jr Hillary Robinette
- 👤 Charles W Pfeifer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:26
CPC Classifications
A; A61; A61Q; A61Q19/00; A61Q19/10; A61K; A61K8/00; A61K8/18; A61K8/72; A61K8/81; A61K8/8164; C; C08; C08F; C08F8/00
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
102 words
A PROCESS FOR PREPARING AMMONIUM SALTS OF ACIDIC COPOLYMERS IN RELATIVELY PURE DRY FORM WHICH COMPRISES THE STEPS OF MIXING A DRY POWDERED AMMONIUM CARBONATE IN SUBSTANTIALLY EQUIMOLAR PROPORTIONS BY WEIGHT WITH AN ACIDIC COPOLYMER FORMED BY COPOLYMERIZING AN ETHYLENE DICARBONYL COMPOUND OF THE GROUP CONSISTING OF MALEIC ANHYDRIDE, CHLORO MALEIC ACID, THE FUMARIC ACID HALIDES, FUMARIC ACID, PHENYL MALEIC ACID, ETHYL MALEIC ACID, DEITHYL MALEIC ACID, DIPHENYL MALEIC ACID AND CITRATONIC ACID, AN UNCONJUGATED CROSS-LINKING AGENT HAVING AT LEAST TWO ETHYLENIC GROUPS, AND A COMPOUND CAPABLE OF COPOLYMERIZING WITH SAID ETHYLENE DICARBONYL COMPOUND AND SAID CROSS-LINKING AGENT AND CONTAINING A SINGLE
References Cited (Backward Citations)
US2409861A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-09 | 1956-06-09 | 1956-12-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-09 | 1960-06-09 | 1960-12-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-09 | 1964-06-09 | 1964-12-09 | $7700.00 | Window Closed / Lapsed |