US3062796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of synthetic elastomers
Assignee: Shell USA Inc
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Filing: 1959-05-11
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Granted: 1962-11-06
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Expires: 1979-05-11
Abstract
No abstract record available.
Inventors
- 👤 Greene Charles Richard
- 👤 Jr-Ii Joseph Mcclintock Kunkel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:47
CPC Classifications
C; C08; C08F; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
IN THE PROCESS FOR PRODUCING SYNTHETIC ELASTOMERS FROM HYDROCARBON SOLUTIONS THEREOF, THE ELASTOMER BEING SELECTED FROM THE GROUP CONSISTING OF CIS-1,4-POLYBUTADIENE, CIS-1,4-POLYISOPRENE AND ETHYLENE-PROPYLENE COPOLYMER, THE SAID PROCESS BEING BY POLYMERIZATION IN A POLYMERIZATION VESSEL AT TEMPERATURES RANGING 25 TO 100* C., THE POLYMERIZATION BEING ACCOMPANIED BY THE GENERATION AND ACCUMULATION OF FOAM AND THE ELASTOMER BEING IN SOLUTION THROUGHOUT THE POLYMERIZATION, THE IMPROVEMENT COMPRISING CONDENSING AND ACCUMULATING EVAPORATING SOLVENT, THEREAFTER ALTERNATING BETWEEN (1) SPRAYING A PORTION OF THE ACCUMULATED SOLVENT INTO THE VAPOR SPACE OF THE POLYMERIZATION VESSEL, THE SPRAY COMING IN DIRECT CONTACT WITH THE FOAM, AND (2) RECIRCULATING ACCUMULATED SOLVENT INTO THE ELASTOMER SOLUTION BELOW THE LIQUID LEVEL OF THE ELASTOMER SOLUTION.
Claim 2
Dependent Claim
115 words
IN THE PROCESS FOR PRODUCING SYNTHETIC ELASTOMERS FROM HYDROCARBON SOLUTIONS THEREOF, THE ELASTOMER BEING SELECTED FROM THE GROUP CONSISTING OF CIS-1,4-POLYBUTADIENE, CIS-1,4-POLYISOPRENE AND ETHYLENE-PROPYLENE COPOLYMER, THE SAID PROCESS BEING BY POLYMERIZATION IN A POLYMERIZATION VESSEL AT TEMPERATURES RANGING 25 TO 100* C., THE POLYMERIZATION BEING ACCOMPANIED BY THE GENERATION AND ACCUMULATION OF FOAM AND THE ELASTOMER BEING IN SOLUTION THROUGHOUT THE POLYMERIZATION, THE IMPROVEMENT COMPRISING CONDENSING AND ACCUMULATING EVAPORATING SOLVENT, THEREAFTER ALTERNATING BETWEEN (1) SPRAYING A PORTION OF THE ACCUMULATED SOLVENT INTO THE VAPOR SPACE OF THE POLYMERIZATION VESSEL, THE SPRAY COMING IN DIRECT CONTACT WITH THE FOAM, AND (2) RECIRCULATING ACCUMULATED SOLVENT INTO THE ELASTOMER SOLUTION BELOW THE LIQUID LEVEL OF THE ELASTOMER SOLUTION.
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) | 1965-11-05 | 1966-05-07 | 1966-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-05 | 1970-05-07 | 1970-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-05 | 1974-05-07 | 1974-11-06 | $7700.00 | Window Closed / Lapsed |