Patent US2970988A successfully refreshed from Google Patents.
US2970988A
Expired / Lapsed
US
⏱️ 0.0 years remaining
New fluorine-containing polymers and preparation thereof
Assignee: 3M Co
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Filing: 1955-10-14
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Granted: 1961-02-07
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Expires: 1975-10-14
Abstract
No abstract record available.
Inventors
- 👤 Elizabeth S Lo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:53
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/182; C08F236/00; C08F236/02; C08F236/04; C08F236/14; C08F236/16
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
40 words
A NORMALLY SOLID COPOLYMER OF BETWEEN ABOUT 2 AND ABOUT 15 MOL PERCENT 2,3,3,3-TETRAFLUOROPROPENE AND CORRESPONDINGLY BETWEEN ABOUT 98 AND ABOUT 85 MOL PERCENT OF A FLUORINATED ETHYLENE SELECTED FROM THE GROUP CONSISTING OF VINYLIDENE FLUORIDE, TRIFLUOROETHYLENE, TRIFLUOROCHLOROETHYLENE AND TETRAFLUOROETHYLENE.
Claim 2
Dependent Claim
40 words
A NORMALLY SOLID COPOLYMER OF BETWEEN ABOUT 2 AND ABOUT 15 MOL PERCENT 2,3,3,3-TETRAFLUOROPROPENE AND CORRESPONDINGLY BETWEEN ABOUT 98 AND ABOUT 85 MOL PERCENT OF A FLUORINATED ETHYLENE SELECTED FROM THE GROUP CONSISTING OF VINYLIDENE FLUORIDE, TRIFLUOROETHYLENE, TRIFLUOROCHLOROETHYLENE AND TETRAFLUOROETHYLENE.
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) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |