Patent US3969562A successfully refreshed from Google Patents.
US3969562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous polymer film
Assignee: Panasonic Holdings Corp
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Filing: 1974-12-24
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Granted: 1976-07-13
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Expires: 1994-12-24
Abstract
Abstract A plane-oriented, open porous film consisting of 100 parts by weight of crystalline high molecular material and 1 to 300 parts by weight of material having a lower melting point than that of the crystalline high molecular material, including a number of flat, fine voids extending along the rectangular direction of the thickness in the film and fine arc-shaped fiber structures on the surface thereof. The film exhibits a high degree of electric insulation, a high mechanical strength and a high permeability to gas as well as to certain liquids.
Inventors
- 👤 Takashi Suzuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 01:07
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; C08J2323/00; C08J2323/02; Y; Y10; Y10S; Y10S428/00; Y10S428/91; Y10T; Y10T428/00; Y10T428/24; Y10T428/24355; Y10T428/24471
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A plane-oriented, open porous film consisting of 100 parts by weight of crystalline high molecular material and 1 to 300 parts by weight of material having a lower melting point than that of said crystalline high molecular material, said film including a number of fine flat voids extending in the rectangular direction of the thickness in the film and fine arcshaped fiber structures on the surface thereof wherein said surface fiber has a mean diameter of 0.01 to 50 microns, the voids have a void mean diameter along the plane of 0.1 to 100 microns, and having a void content in the direction of the thickness of 10 to 10,000/mm.
Claim 2
Dependent Claim
110 words
A plane-oriented, open porous film consisting of 100 parts by weight of crystalline high molecular material and 1 to 300 parts by weight of material having a lower melting point than that of said crystalline high molecular material, said film including a number of fine flat voids extending in the rectangular direction of the thickness in the film and fine arcshaped fiber structures on the surface thereof wherein said surface fiber has a mean diameter of 0.01 to 50 microns, the voids have a void mean diameter along the plane of 0.1 to 100 microns, and having a void content in the direction of the thickness of 10 to 10,000/mm.
Claim 3
Dependent Claim
44 words
A plane-oriented, open porous film according to claim 1 wherein said crystalline high molecular material is polyolefin resin, and said material of lower melting point is at least one material selected from the group consisting of other polyolefin resin, silicone resin, and polyamide resin.
Claim 4
Dependent Claim
27 words
A plane-oriented, open porous film according to claim 2 wherein said crystalline high molecular material is isotactic polypropylene, and said material of lower melting point is polyethylene.
Claim 5
Dependent Claim
45 words
A plane-oriented, open porous film according to claim 1 wherein said crystalline high molecular material is polyester resin, and said material of lower melting point is at least one material selected from the group consisting of polyolefin resin, polyamide resin, polyvinyl resin, polystyrene and polycarbonate.
Claim 6
Dependent Claim
47 words
A plane-oriented, open porous film according to claim 1 wherein said crystalline high molecular material is polyamide resin, and said material of lower melting point is at least one material selected from the group consisting of polyvinyl resin, polyester resin, polyvinylidene resin, polyether resin and polyacrylic resin.
Claim 7
Dependent Claim
43 words
A plane-oriented, open porous film according to claim 1 wherein said crystalline high molecular material is polyvinylidene resin, and said material of lower melting point is at least one material selected from the group consisting of polyvinyl resin, polyether resin and polyamide resin.
References Cited (Backward Citations)
US3841943A
Cited
US3765999A
Cited
US3725520A
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US3783088A
Cited
US3773608A
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US3773609A
Cited
US3801404A
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US3758661A
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US3839516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |