US3069401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of hexafluoropropylene vinylidene fluoride and aliphatic, chain transfer agents
Assignee: EIDP Inc
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Filing: 1960-02-23
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Granted: 1962-12-18
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Expires: 1980-02-23
Abstract
No abstract record available.
Inventors
- 👤 George A Gallagher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:22
CPC Classifications
C; C08; C08F; C08F214/00; C08F214/18; C08F214/22; C08F214/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
5 words
COPOLYMERS COMPRISING (A) -CH2-CF2- UNITS,
Claim 2
Dependent Claim
5 words
COPOLYMERS COMPRISING (A) -CH2-CF2- UNITS,
Claim 3
Dependent Claim
116 words
THE PROCESS FOR PREPARING A COPOLYMER HAVING AN INHERENT VISCOSITY RANGING FROM ABOUT 0.025 TO 0.25 AT 30*C. WHEN DISSOLVED IN AN ANHYDROUS SOLVENT CONSISTING OF 86.1 PERCENT BY WEIGHT, OF TETRAHYDROFURAN AND 13.9 PERCENT BY WEIGHT OF DIMETHYLFORMAMIDE AT A CONCENTRATION OF 0.1 PERCENT BY WEIGHT, WHICH COMPRISES HEATING, AT A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 250*C. UNDER AUTOGENOUS PRESURE, A MIXTURE OF (A) VINYLIDENE FLUORIDE, (B) HEAXFLUOROPROPENE AND (C) A CHAIN TRANSFER AGAENT IN CONTACT WITH A NON-METALLIC ORGANIC PEROXIDE, SAID CHAIN TRANSFER AGENT BEING A HALOGEN-FREE, SATURATED ACYCLIC COMPOUND CONTAINING UP TO 8 CARBON ATOMS, SAID ACYCLIC COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS, KETONES AND CARBOXYLIC ACID ESTERS.
Claim 4
Dependent Claim
116 words
THE PROCESS FOR PREPARING A COPOLYMER HAVING AN INHERENT VISCOSITY RANGING FROM ABOUT 0.025 TO 0.25 AT 30*C. WHEN DISSOLVED IN AN ANHYDROUS SOLVENT CONSISTING OF 86.1 PERCENT BY WEIGHT, OF TETRAHYDROFURAN AND 13.9 PERCENT BY WEIGHT OF DIMETHYLFORMAMIDE AT A CONCENTRATION OF 0.1 PERCENT BY WEIGHT, WHICH COMPRISES HEATING, AT A TEMPERATURE OF FROM ABOUT 100*C. TO ABOUT 250*C. UNDER AUTOGENOUS PRESURE, A MIXTURE OF (A) VINYLIDENE FLUORIDE, (B) HEAXFLUOROPROPENE AND (C) A CHAIN TRANSFER AGAENT IN CONTACT WITH A NON-METALLIC ORGANIC PEROXIDE, SAID CHAIN TRANSFER AGENT BEING A HALOGEN-FREE, SATURATED ACYCLIC COMPOUND CONTAINING UP TO 8 CARBON ATOMS, SAID ACYCLIC COMPOUND BEING SELECTED FROM THE GROUP CONSISTING OF ALCOHOLS, KETONES AND CARBOXYLIC ACID ESTERS.
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) | 1965-12-17 | 1966-06-18 | 1966-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-17 | 1970-06-18 | 1970-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-17 | 1974-06-18 | 1974-12-18 | $7700.00 | Window Closed / Lapsed |