Patent US3023187A successfully refreshed from Google Patents.
US3023187A
Expired / Lapsed
US
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Process of copolymerizing hexafluoropropene with vinylidene fluoride in the presenceof silica and the product thereof
Assignee: 3M Co
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Filing: 1958-04-02
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Granted: 1962-02-27
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Expires: 1978-04-02
Abstract
No abstract record available.
Inventors
- 👤 Lo Elizabeth Shen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:19
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/28; C08F214/22
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
105 words
A PROCESSD WHICH COMPRISES COPOLYMERIZING A MONOMER MIXTURE OF BETWEEN ABOUT 5 AND ABOUT 95 MOL PER CENT HEXAFLUUOROPRONE AND BETWEEN ABOUT 95 AND ABOUT 5 MOL PERCENT OF VINYLIDENE FLUORIDE IN THE PRESENCE OF AN AQUEOUS POLYMERIZATION CATALYST SYSTEM CONTAINING BETWEEN ABOUT 2 AND ABOUT 30 PARTS OF AN ADSORPTIVE SILICA PER 100 PARTS OF TOTAL MONOMER, SAID ADSORPTIVE SILICA BEING SELECTED FROM THE GROUP CONSISTING OF MODIFIED AND UNMODIFIED SILICA AND HAVING A PARTICLE SIZE OF EXCEEDING 20 MICRONS, TO PRODUCE A COPOLYMER OF HEXAFLUOROPROPENE AND VINYLIDENE FLUORIDE CONTAINING SAID ADSORPTIVE SILICA AND HAVING A TENSILE STRENGTH OF AT LEAST ABOUT 1500 P.S.I.
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) | 1965-02-26 | 1965-08-28 | 1966-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-02-26 | 1969-08-28 | 1970-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-02-26 | 1973-08-28 | 1974-02-27 | $7700.00 | Window Closed / Lapsed |