Patent US2521359A successfully refreshed from Google Patents.
US2521359A
Expired / Lapsed
US
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Copolymers of cyclopentadiene
Assignee: Standard Oil Development Co
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Filing: 1945-11-27
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Granted: 1950-09-05
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Expires: 1965-11-27
Abstract
No abstract record available.
Inventors
- 👤 John D Garber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:06
CPC Classifications
C; C08; C08F; C08F232/00; C08F232/02; C08F232/06; C08F236/00; C08F236/02; C08F236/04; C08F36/00; C08F36/02; C08F36/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
213 words
THE METHOD OF PREPARING A HOMOGENEOUS COPOLYMER OF A CYCLOPENTADIENE AND A MONO-OLEFIN COMPRISING THE STEPS IN COMBINATION OF PREPARING A MIXTURE CONTAINING A SUBSTANTIAL EXCESS OF THE MONO-OLEFIN, SUFFLICIENT TO PRODUCE A COPOLYMER CONTAINING THE DESIRED MAJOR AMOUNT OF THE CYCLOPENTADIENE, COOLING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE BETWEEN -10*C. AND -164*C. IN THE PRESENCE OF A DILUENT-SOLVENT FOR THE MONO-OLEFIN AND CYCLOPENTADIENE COMPOUND, STARTING THE FLOW INTO THE COLD MIXTURE OF A SMALL STREAM OF FLUID FRIEDEL-CRAFTS ACTIVE METAL HALIDE CATALYST, AND SIMULTANEOUSLY STARTING THE FLOW INTO THE MIXTURE OF A SMALL STREAM OF MIXED CYCLOPENTADIENE COMPOUND AND MONO-OLEFIN, MIXED IN THE PROPORTION DESIRED IN THE FINISHED POLYMER, THE STREAM OF MIXED OLEFINS BEING DELIVERED AT APPROXIMATELY THE RATE AT WHICH POLYMERIZATION IS TAKING PLACE, WHEREBY A SUFFICIENT EXCESS OF MONO-OLEFIN IN MAINTAINED IN THE MIXTURE TO FORCE INTO THE COPOLYMER THE DESIRED AMOUNT OF MONO-OLEFIN TO PRODUCE A COPOLYMER CONTAINING IN THE POLYMER MOLECULE A MAJOR PROPORTION OF THE CYCLENTADIENE, THE COPOLYMER BEING CHARACTERIZED BY A STAUDINGER MOLECULAR WEIGHT NUMBER WITHIN THE RANGE BETWEEN 3,000 AND 100,000; AN IODINE NUMBER WITHIN THE RANGE BETWEEN 50 AND 300; REACTIVITY WIDTH SULFUR IN A CURING REACTION TO REDUCE THE HYDROCARBON SOLUBILITY AND REACTIVITY WITH ATMOSPHERIC OXYGEN IN A DRYING REACTION.
Claim 2
Independent Claim
213 words
THE METHOD OF PREPARING A HOMOGENEOUS COPOLYMER OF A CYCLOPENTADIENE AND A MONO-OLEFIN COMPRISING THE STEPS IN COMBINATION OF PREPARING A MIXTURE CONTAINING A SUBSTANTIAL EXCESS OF THE MONO-OLEFIN, SUFFLICIENT TO PRODUCE A COPOLYMER CONTAINING THE DESIRED MAJOR AMOUNT OF THE CYCLOPENTADIENE, COOLING THE MIXTURE TO A TEMPERATURE WITHIN THE RANGE BETWEEN -10*C. AND -164*C. IN THE PRESENCE OF A DILUENT-SOLVENT FOR THE MONO-OLEFIN AND CYCLOPENTADIENE COMPOUND, STARTING THE FLOW INTO THE COLD MIXTURE OF A SMALL STREAM OF FLUID FRIEDEL-CRAFTS ACTIVE METAL HALIDE CATALYST, AND SIMULTANEOUSLY STARTING THE FLOW INTO THE MIXTURE OF A SMALL STREAM OF MIXED CYCLOPENTADIENE COMPOUND AND MONO-OLEFIN, MIXED IN THE PROPORTION DESIRED IN THE FINISHED POLYMER, THE STREAM OF MIXED OLEFINS BEING DELIVERED AT APPROXIMATELY THE RATE AT WHICH POLYMERIZATION IS TAKING PLACE, WHEREBY A SUFFICIENT EXCESS OF MONO-OLEFIN IN MAINTAINED IN THE MIXTURE TO FORCE INTO THE COPOLYMER THE DESIRED AMOUNT OF MONO-OLEFIN TO PRODUCE A COPOLYMER CONTAINING IN THE POLYMER MOLECULE A MAJOR PROPORTION OF THE CYCLENTADIENE, THE COPOLYMER BEING CHARACTERIZED BY A STAUDINGER MOLECULAR WEIGHT NUMBER WITHIN THE RANGE BETWEEN 3,000 AND 100,000; AN IODINE NUMBER WITHIN THE RANGE BETWEEN 50 AND 300; REACTIVITY WIDTH SULFUR IN A CURING REACTION TO REDUCE THE HYDROCARBON SOLUBILITY AND REACTIVITY WITH ATMOSPHERIC OXYGEN IN A DRYING REACTION.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-09-04 | 1954-03-06 | 1954-09-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-09-04 | 1958-03-06 | 1958-09-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-09-04 | 1962-03-06 | 1962-09-05 | $7700.00 | Window Closed / Lapsed |