US2713573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of acrylonitrile and n-lactams
Assignee: Celanese Corp
•
Filing: 1952-11-01
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Granted: 1955-07-19
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Expires: 1972-11-01
Abstract
No abstract record available.
Inventors
- 👤 Calvin E Schildknecht
- 👤 Mary L Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:30
CPC Classifications
C; C08; C08F; C08F220/00; C08F220/02; C08F220/42; C08F220/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
IN A PROCESS FOR THE PRODUCTION OF COPOLYMERS OF ACRYLONITRILE AND N-VINYL LACTAMS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN AN AQUEOUS MEDIUM CONTAINING A PERSULFATE POLYMERIZATION CATALYST, AND A REDUCIBLE SULFUR COMPOUND HAVING AN S=O GROUP AS AN ACCELERATOR, SAID MEDIUM BEING BUFFERED TO A PH OF BETWEEN ABOUT 5 AND 8 AND HAVING CARBON DIOXIDE DISSOLVED THEREIN.
Claim 2
Dependent Claim
61 words
IN A PROCESS FOR THE PRODUCTION OF COPOLYMERS OF ACRYLONITRILE AND N-VINYL LACTAMS, THE IMPROVEMENT WHICH COMPRISES CARRYING OUT THE POLYMERIZATION IN AN AQUEOUS MEDIUM CONTAINING A PERSULFATE POLYMERIZATION CATALYST, AND A REDUCIBLE SULFUR COMPOUND HAVING AN S=O GROUP AS AN ACCELERATOR, SAID MEDIUM BEING BUFFERED TO A PH OF BETWEEN ABOUT 5 AND 8 AND HAVING CARBON DIOXIDE DISSOLVED THEREIN.
References Cited (Backward Citations)
US2436926A
Cited
BE500644A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-07-18 | 1959-01-17 | 1959-07-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-07-18 | 1963-01-17 | 1963-07-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-07-18 | 1967-01-17 | 1967-07-19 | $7700.00 | Window Closed / Lapsed |