US4096099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous synthetic resin film
Assignee: Tosoh Corp
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Filing: 1976-05-14
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Granted: 1978-06-20
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Expires: 1996-05-14
Abstract
Abstract A porous synthetic resin film which comprises fine cylindrical holes of from 70 to 2,000 A in diameter which are formed by removing the fine cylindrical component of an AB-type or an ABA-type block copolymer.
Inventors
- 👤 Kenji Koyama
- 👤 Syotaro Ohno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:06
CPC Classifications
B; B01; B01D; B01D67/00; B01D67/0002; B01D67/0023; B01D67/003; B01D67/0031; B01D39/00; B01D39/14; B01D39/16; B01D39/1692; B01D69/00; B01D69/02
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
44 words
A porous synthetic resin film which comprises fine cylindrical holdes of from 70 to 3,000 A in diameter which are formed by removing the fine cylindrical component from the continuous phase component of a film of a block copolymer of the AB or ABA-type.
Claim 2
Dependent Claim
44 words
A porous synthetic resin film which comprises fine cylindrical holdes of from 70 to 3,000 A in diameter which are formed by removing the fine cylindrical component from the continuous phase component of a film of a block copolymer of the AB or ABA-type.
Claim 3
Dependent Claim
55 words
The porous synthetic resin film of claim 1 wherein said continuous phase component is selected from the group consisting of polyacrylonitrile, polymethyacrylonitrile, polymethylmethacrylate, polystyrene, poly-t-butyl crotonate, polybutylisocyanate, polyamylisocyanate, polyhexylisocyanate, polyoctylisocyanate, polycarbonates and polyesters and said fine cylindrical component is selected from the group consisting of polybutadiene, polyisoprene, polychloroprene, polymethylvinyl ketone, polyphenylvinyl ketone, polyesters, polycarbonates, polyamides.
Claim 4
Dependent Claim
28 words
The porous synthetic resin film of claim 1 wherein said continuous phase component is bonded with an ester bond or an amide bond to the fine cylindrical component.
Claim 5
Dependent Claim
20 words
The porous synthetic resin film of claim 1 wherein said fine cylindrical component is decomposed by oxidation, photodisintegration or hydrolysis.
Claim 6
Dependent Claim
19 words
The porous synthetic resin film of claim 4 wherein the decomposed fine cylindrical component is removed with a solvent.
Claim 7
Independent Claim
43 words
A method of preparing a porous synthetic resin film having fine cylindrical holes from 70 to 3,000 A in diameter which comprises removing the fine cylindrical component from the continuous phase component of a film of an AB-type or an ABA-type block copolymer.
Claim 8
Independent Claim
43 words
A method of preparing a porous synthetic resin film having fine cylindrical holes from 70 to 3,000 A in diameter which comprises removing the fine cylindrical component from the continuous phase component of a film of an AB-type or an ABA-type block copolymer.
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) | 1981-06-19 | 1981-12-19 | 1982-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-06-19 | 1985-12-19 | 1986-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-06-19 | 1989-12-19 | 1990-06-20 | $7700.00 | Window Closed / Lapsed |