US4298719A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Doubly oriented film of polyvinylidene fluoride
Assignee: Kureha Corp
•
Filing: 1979-07-19
•
Granted: 1981-11-03
•
Expires: 1999-07-19
Abstract
Abstract Polyvinylidene fluoride film having its crystalline region occupied predominantly by form I crystals, characterized in that the crystals are substantially double oriented.
Inventors
- 👤 Toshiya Mizuno
- 👤 Mitsuru Ohta
- 👤 Masahiro Segawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:42
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C55/00; B29C55/005; B29C55/02; B29C55/10; B29C55/12; B29C55/14; H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/098; B29K; B29K2027/00; B29K2027/12; B29K2027/16; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/16; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31678; Y10T428/31692
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
21 words
A biaxially stretched film of polyvinylidene fluoride having a crystal region which is predominantly occupied by doubly oriented form I crystals.
Claim 2
Dependent Claim
21 words
A biaxially stretched film of polyvinylidene fluoride having a crystal region which is predominantly occupied by doubly oriented form I crystals.
Claim 3
Dependent Claim
25 words
A film according to claim 1 wherein said form I crystals of polyvinylidene fluoride occupy more than 65% of said crystal region of said film.
Claim 4
Dependent Claim
51 words
A film according to claim 1 wherein said polyvinylidene fluoride is a homopolymer of vinylidene fluoride or a copolymer of vinylidene fluoride with a comonomer selected from the group consisting of tetrafluoroethylene, hexafluoropropylene, chlorotrifluoroethylene, vinyl fluoride and hexafluorobutene having more than 80% by weight of vinylidene fluoride units in said copolymer.
Claim 5
Dependent Claim
25 words
A film according to claim 1 wherein said form I crystals of polyvinylidene fluoride occupy more than 75% of said crystal region of said film.
Claim 6
Dependent Claim
61 words
The biaxially stretched film of claim 1 wherein said crystal region contains six point-images or six arc-images of said form I crystals in a wide angle x-ray diffraction pattern of the (200) plane and the (110) plane on the incidence of CuK.sub.α x-ray perpendicular to the cross-section of said film crossing the axis of the second axial stretching at right angles.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-11-02 | 1985-05-04 | 1985-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-11-02 | 1989-05-04 | 1989-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-11-02 | 1993-05-04 | 1993-11-03 | $7700.00 | Window Closed / Lapsed |