US2665270A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing copolymers of styrene and divinylbenzene
Assignee: PETROCARBON Ltd
•
Filing: 1951-12-10
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Granted: 1954-01-05
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Expires: 1971-12-10
Abstract
No abstract record available.
Inventors
- 👤 Robert N Haward
- 👤 Elly Joyce
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:20
CPC Classifications
C; C08; C08F; C08F212/00; C08F212/02; C08F212/04; C08F212/06; C08F212/08; C08F2/00; C08F2/12; C08F2/16; C08F2/18; C08F2/44; C08F212/34; C08F212/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
77 words
A PROCESS FOR THE PRODUCTION OF COPOLYMERS OF STYRENE AND DIVINYLBENZENE BY A SUSPENSION POLYMERISATION PROCESS, WHICH COMPRISES POLYMERISING A MIXTURE OF STYRENE AND DIVINYLBENZENE WHILST IT IS MAINTAINED DISPERSED IN AN AQUEOUS MEDIUM IN WHICH THERE ARE ALSO DISPERSED FINELY DIVIDED PARTICLES OF BENTONITE AND IN WHICH THERE HAS BEEN DISSOLVED GELATIN AND A SUBSTANTIALLY NEUTRAL INORGANIC SALT SELECTED FROM THE CLASS CONSISTING OF THE SUBSTANTIALLY NEUTRAL INORGANIC SALTS OF ALKALI METALS AND ALKALINE EARTH METALS.
Claim 2
Dependent Claim
77 words
A PROCESS FOR THE PRODUCTION OF COPOLYMERS OF STYRENE AND DIVINYLBENZENE BY A SUSPENSION POLYMERISATION PROCESS, WHICH COMPRISES POLYMERISING A MIXTURE OF STYRENE AND DIVINYLBENZENE WHILST IT IS MAINTAINED DISPERSED IN AN AQUEOUS MEDIUM IN WHICH THERE ARE ALSO DISPERSED FINELY DIVIDED PARTICLES OF BENTONITE AND IN WHICH THERE HAS BEEN DISSOLVED GELATIN AND A SUBSTANTIALLY NEUTRAL INORGANIC SALT SELECTED FROM THE CLASS CONSISTING OF THE SUBSTANTIALLY NEUTRAL INORGANIC SALTS OF ALKALI METALS AND ALKALINE EARTH METALS.
References Cited (Backward Citations)
US2171765A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-04 | 1957-07-06 | 1958-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-04 | 1961-07-06 | 1962-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-04 | 1965-07-06 | 1966-01-05 | $7700.00 | Window Closed / Lapsed |