Patent US2847406A successfully refreshed from Google Patents.
US2847406A
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Cross linked copolymer
Assignee: American Synthetic Rubber Corp
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Filing: 1954-03-15
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Granted: 1958-08-12
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Expires: 1974-03-15
Abstract
No abstract record available.
Inventors
- 👤 Norman R Legge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 07:25
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
76 words
IN THE BATCH EMULSION POLYMERIZATION PROCESS FOR PRODUCING SYNTHETIC RUBBER BY COPOLYMERIZATION OF BUTADIENE AND STYRENE IN THE PROPORTIONS OF 60% TO 83% BUTADIENE AND 40% TO 17% OF STYRENE IN A REACTION MIXTURE THAT INCLUDES DIVINYLBENZENE AS A CROSS-LINKING AGENT, THE IMPROVEMENT WHICH COMPRISES ADDING THE DIVINYL BENZENE TO THE REACTION MIXTURE IN TWO OR MORE SEPARATE PORTIONS AT SUBSTANTIALLY SPACED INTERVALS DURING THE REACTION PERIOD TO IMPROVE THE TENSILE STRENGTH OF THE RUBBER POLYMER.
Claim 2
Dependent Claim
76 words
IN THE BATCH EMULSION POLYMERIZATION PROCESS FOR PRODUCING SYNTHETIC RUBBER BY COPOLYMERIZATION OF BUTADIENE AND STYRENE IN THE PROPORTIONS OF 60% TO 83% BUTADIENE AND 40% TO 17% OF STYRENE IN A REACTION MIXTURE THAT INCLUDES DIVINYLBENZENE AS A CROSS-LINKING AGENT, THE IMPROVEMENT WHICH COMPRISES ADDING THE DIVINYL BENZENE TO THE REACTION MIXTURE IN TWO OR MORE SEPARATE PORTIONS AT SUBSTANTIALLY SPACED INTERVALS DURING THE REACTION PERIOD TO IMPROVE THE TENSILE STRENGTH OF THE RUBBER POLYMER.
References Cited (Backward Citations)
US2474807A
Cited
US2684356A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-11 | 1962-02-10 | 1962-08-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-11 | 1966-02-10 | 1966-08-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-11 | 1970-02-10 | 1970-08-12 | $7700.00 | Window Closed / Lapsed |