Patent US3377324A successfully refreshed from Google Patents.
US3377324A
Expired / Lapsed
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Method for preparing polysulfones
Assignee: Shell USA Inc
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Filing: 1966-03-17
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Granted: 1968-04-09
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Expires: 1986-03-17
Abstract
No abstract record available.
Inventors
- 👤 Mostert Simon
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:26
CPC Classifications
C; C08; C08G; C08G75/00; C08G75/20; C08G75/205; C08G75/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
119 words
THE METHOD OF PREVENTING GELATION OF A POLYSULFONE SELECTED FROM THE GROUP CONSISTING OF A COPOLYMER OF A CONJUGATED DIOLEFIN HAVING FROM 4 TO ABOUT 8 CARBON ATOMS AND SULFUR DIOXIDE, AND A POLYMER OF A CONJUGATED DIOLEFIN HAVING FROM 4 TO ABOUT 8 CARBON ATOMS, SULFUR DIOXIDE AND AT LEAST ONE COPOLYMERIZABLE ETHYLENICALLY UNSATURATED MONOMER HAVING FROM 2 TO ABOUT 20 CARBON ATOMS PREPARED IN AN EMULSION IN THE PRESENCE OF A FREE RADICAL INITIATOR COMPRISING THE STEP JOF ADDING TO THE POLYMERIZATION MIXTURE FROM ABOUT 0.001 AND 1% BY WEIGHT BASED ON THE TOTAL REACTILON MLIXTURE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) A PHENOL, (B) A TRIARYL PHOSPHITE, AND (C) AN ARYL BORATE.
Claim 2
Independent Claim
119 words
THE METHOD OF PREVENTING GELATION OF A POLYSULFONE SELECTED FROM THE GROUP CONSISTING OF A COPOLYMER OF A CONJUGATED DIOLEFIN HAVING FROM 4 TO ABOUT 8 CARBON ATOMS AND SULFUR DIOXIDE, AND A POLYMER OF A CONJUGATED DIOLEFIN HAVING FROM 4 TO ABOUT 8 CARBON ATOMS, SULFUR DIOXIDE AND AT LEAST ONE COPOLYMERIZABLE ETHYLENICALLY UNSATURATED MONOMER HAVING FROM 2 TO ABOUT 20 CARBON ATOMS PREPARED IN AN EMULSION IN THE PRESENCE OF A FREE RADICAL INITIATOR COMPRISING THE STEP JOF ADDING TO THE POLYMERIZATION MIXTURE FROM ABOUT 0.001 AND 1% BY WEIGHT BASED ON THE TOTAL REACTILON MLIXTURE OF A COMPOUND SELECTED FROM THE GROUP CONSISTING OF (A) A PHENOL, (B) A TRIARYL PHOSPHITE, AND (C) AN ARYL BORATE.
References Cited (Backward Citations)
US3336274A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-04-09 | 1971-10-09 | 1972-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-04-09 | 1975-10-09 | 1976-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-04-09 | 1979-10-09 | 1980-04-09 | $7700.00 | Window Closed / Lapsed |