US2605246A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing a solution of an acrylonitrile polymerization product
Assignee: Wyeth Holdings LLC
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Filing: 1951-04-06
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Granted: 1952-07-29
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Expires: 1971-04-06
Abstract
No abstract record available.
Inventors
- 👤 Cresswell Arthur
- 👤 Jr Percival W Cummings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:14
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/03; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
120 words
THE METHOD OF FORMING A SOLUTION OF AN ACRYLONITRILE POLYMER COMPRISED MAINLY OF COMBINED ACRYLONITRILE, SAID METHOD COMPRISING DISPERSING SAID POLYMER IN WATER CONTAINING A WATER-SOLUBLE SALT WHICH YIELDS HIGHLY HYDRATED IONS IN AN AQUEOUS SOLUTION, THE AMOUNT OF THE SAID SALT WHICH IS PRESENT IN THE WATER BEING LESS THAN THE CRITICAL CONCENTRATION REQUIRED IN ORDER TO FORM A SOLUTION THAT WILL DISSOLVE THE SAID POLYMER; AND ADDING TO THE RESULTING DISPERSION AN ADDITIONAL AMOUNT OF THE SAME SALT, THE AMOUNT AND CONCENTRATION THEREOF BEING SUCH THAT, AFTER ADDING SAID SALT TO SAID DISPERSION, THE CONCENTRATION OF SAID SALT IN THE RSULTING MIXTURE IS ABOVE THE CRITICAL CONCENTRATION OF SALT REQUIRED IN ORDER TO DISSOLVE THE SAID POLYMER THEREIN.
Claim 2
Independent Claim
120 words
THE METHOD OF FORMING A SOLUTION OF AN ACRYLONITRILE POLYMER COMPRISED MAINLY OF COMBINED ACRYLONITRILE, SAID METHOD COMPRISING DISPERSING SAID POLYMER IN WATER CONTAINING A WATER-SOLUBLE SALT WHICH YIELDS HIGHLY HYDRATED IONS IN AN AQUEOUS SOLUTION, THE AMOUNT OF THE SAID SALT WHICH IS PRESENT IN THE WATER BEING LESS THAN THE CRITICAL CONCENTRATION REQUIRED IN ORDER TO FORM A SOLUTION THAT WILL DISSOLVE THE SAID POLYMER; AND ADDING TO THE RESULTING DISPERSION AN ADDITIONAL AMOUNT OF THE SAME SALT, THE AMOUNT AND CONCENTRATION THEREOF BEING SUCH THAT, AFTER ADDING SAID SALT TO SAID DISPERSION, THE CONCENTRATION OF SAID SALT IN THE RSULTING MIXTURE IS ABOVE THE CRITICAL CONCENTRATION OF SALT REQUIRED IN ORDER TO DISSOLVE THE SAID POLYMER THEREIN.
References Cited (Backward Citations)
US2140921A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-07-29 | 1956-01-28 | 1956-07-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-07-29 | 1960-01-28 | 1960-07-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-07-29 | 1964-01-28 | 1964-07-29 | $7700.00 | Window Closed / Lapsed |