Patent US3222342A successfully refreshed from Google Patents.
US3222342A
Expired / Lapsed
US
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Polymerization of styrene utilizing frozen boron trifluoride ether complex as the catalyst
Assignee: WR Grace and Co
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Filing: 1961-07-13
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Granted: 1965-12-07
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 Arthur D Ketley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 19:11
CPC Classifications
C; C08; C08F; C08F12/00; C08F12/02; C08F12/04; C08F12/06; C08F12/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
THE METHOD OF PRODUCING CRYSTALLINE POLYSTYRENE WHICH COMPRISES FREEZING SOLID A CORON TRIFLUORIDE ETHER COMPLEX, THE ETHER BEING A LOWER DIALKYL ETHER, DILUTING STYRENE IN AN INERT SOLVENT WHICH IS LIQUID AT A TEMPERATURE BELOW THE FREEZING POINT OF THE BORON TRIFLUORIDE ETHER COMPLEX, AND CONTACTING THE SOLID BORON TRIFLUORIDE ETHER COMPLEX WITH THE SOLUTION OF MONOMER AT A TEMPERATURE BELOW THE FREEZING POINT OF THE BORON TRIFLUORIDE ETHER COMPLEX.
Claim 2
Independent Claim
70 words
THE METHOD OF PRODUCING CRYSTALLINE POLYSTYRENE WHICH COMPRISES FREEZING SOLID A CORON TRIFLUORIDE ETHER COMPLEX, THE ETHER BEING A LOWER DIALKYL ETHER, DILUTING STYRENE IN AN INERT SOLVENT WHICH IS LIQUID AT A TEMPERATURE BELOW THE FREEZING POINT OF THE BORON TRIFLUORIDE ETHER COMPLEX, AND CONTACTING THE SOLID BORON TRIFLUORIDE ETHER COMPLEX WITH THE SOLUTION OF MONOMER AT A TEMPERATURE BELOW THE FREEZING POINT OF THE BORON TRIFLUORIDE ETHER COMPLEX.
References Cited (Backward Citations)
US2559062A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |