US2763636A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of controlling molecular weight of polyacrylonitrile produced in aqueous salt solutions
Assignee: Dow Chemical Co
•
Filing: 1952-08-25
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Granted: 1956-09-18
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Expires: 1972-08-25
Abstract
No abstract record available.
Inventors
- 👤 Clyde W Davis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:04
CPC Classifications
C; C08; C08F; C08F20/00; C08F20/02; C08F20/42; C08F20/44; C08F2/00; C08F2/12; C08F2/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
85 words
THE IMPROVEMENT, IN THE PROCESS OF POLYMERIZING ACRYLONITRILE WHILE THE LATTER IS DISSOLVED IN AN AQUEOUS INORGANIC SALT SOLUTION WHICH IS A SOLVENT FOR THE MONOMER AND FOR THE POLYMER, AND IN WHICH THE SALT CONCENTRATION IS FROM 55 TO 65 PER CENT BY WEIGHT AND THE PRINCIPAL SALINE SOLUTE IS ZINC CHLORIDE, WHICH CONSISTS IN CARRYING OUT THE PROCESS IN SUCH A MEDIUM CONTAINING FROM 0.02 TO 1.0 PART BY WEIGHT OF COOPER IONS FOR EACH MILLION PARTS BY WEIGHT OF THE SALT SOLUTION.
Claim 2
Dependent Claim
85 words
THE IMPROVEMENT, IN THE PROCESS OF POLYMERIZING ACRYLONITRILE WHILE THE LATTER IS DISSOLVED IN AN AQUEOUS INORGANIC SALT SOLUTION WHICH IS A SOLVENT FOR THE MONOMER AND FOR THE POLYMER, AND IN WHICH THE SALT CONCENTRATION IS FROM 55 TO 65 PER CENT BY WEIGHT AND THE PRINCIPAL SALINE SOLUTE IS ZINC CHLORIDE, WHICH CONSISTS IN CARRYING OUT THE PROCESS IN SUCH A MEDIUM CONTAINING FROM 0.02 TO 1.0 PART BY WEIGHT OF COOPER IONS FOR EACH MILLION PARTS BY WEIGHT OF THE SALT SOLUTION.
References Cited (Backward Citations)
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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) | 1959-09-18 | 1960-03-19 | 1960-09-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-09-18 | 1964-03-19 | 1964-09-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-09-18 | 1968-03-19 | 1968-09-18 | $7700.00 | Window Closed / Lapsed |