Patent US2776947A successfully refreshed from Google Patents.
US2776947A
Expired / Lapsed
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Polymer dispersions
Assignee: Celanese Corp
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Filing: 1952-10-31
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Granted: 1957-01-08
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Expires: 1972-10-31
Abstract
No abstract record available.
Inventors
- 👤 Calvin E Schildknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:58
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/02; C08J3/09; C08J2333/00; C08J2333/18; C08J2333/20
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A PROCESS FOR THE PRODUCTION OF A STABLE DISPERSION OF A COPOLYMER OF ACRYLONITRILE AND N-VINYL LACTAM, CONTAINING AT LEAST ABOUT 70 MOLE PERCENT OF ACRYLONITRILE WHICH COMPRISES ADDING TO A SOLUTION OF SAID COPOLYMER A SUFFICIENT QUANTITY OF A NON-SOLVENT FOR SAID COPOLYMER, WHICH NON-SOLVENT IS MISCIBLE WITH THE SOLUTION, TO PRECIPITATE AT LEAST A PORTION OF THE COPOLYMER AS A NON-SETTLING DISPERSED PHASE CAPABLE OF SCATTING LIGHT.
Claim 2
Dependent Claim
69 words
A PROCESS FOR THE PRODUCTION OF A STABLE DISPERSION OF A COPOLYMER OF ACRYLONITRILE AND N-VINYL LACTAM, CONTAINING AT LEAST ABOUT 70 MOLE PERCENT OF ACRYLONITRILE WHICH COMPRISES ADDING TO A SOLUTION OF SAID COPOLYMER A SUFFICIENT QUANTITY OF A NON-SOLVENT FOR SAID COPOLYMER, WHICH NON-SOLVENT IS MISCIBLE WITH THE SOLUTION, TO PRECIPITATE AT LEAST A PORTION OF THE COPOLYMER AS A NON-SETTLING DISPERSED PHASE CAPABLE OF SCATTING LIGHT.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-01-08 | 1960-07-09 | 1961-01-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-01-08 | 1964-07-09 | 1965-01-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-01-08 | 1968-07-09 | 1969-01-08 | $7700.00 | Window Closed / Lapsed |