US4283442A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a dimensionally stable battery separator
Assignee: Japan Atomic Energy Agency
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Filing: 1980-02-04
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Granted: 1981-08-11
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Expires: 2000-02-04
Abstract
Abstract A method of producing a dimensionally stable battery separator characterized by grafting acrylic acid and/or methacrylic acid onto a polyethylene film, treating the resulting membrane with an aqueous alkaline solution, and drying the treated membrane under application of tension.
Inventors
- 👤 Sueo Machi
- 👤 Isao Ishigaki
- 👤 Takanobu Sugo
- 👤 Kazuo Murata
- 👤 Shiro Tanso
- 👤 Keizi Senoo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:24
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/16; C08J7/18; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; C08J2323/00; C08J2323/02; C08J2323/04; C08J2323/06; H01M2300/00; H01M2300/0002; H01M2300/0014; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
39 words
A method of producing a dimensionally stable battery separator characterized by grafting acrylic acid and/or methacrylic acid onto a polyethylene film, treating the resulting membrane with an aqueous alkaline solution, and drying the treated membrane under application of tension.
Claim 2
Independent Claim
39 words
A method of producing a dimensionally stable battery separator characterized by grafting acrylic acid and/or methacrylic acid onto a polyethylene film, treating the resulting membrane with an aqueous alkaline solution, and drying the treated membrane under application of tension.
Claim 3
Dependent Claim
20 words
A method of claim 1 wherein the tension applied to the membrane is from 2 to 80 kg/cm 2 .
Claim 4
Dependent Claim
20 words
A method of claim 1 wherein the tension applied to the membrane is from 5 to 30 kg/cm 2 .
References Cited (Backward Citations)
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US3427206A
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US3892594A
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US4031162A
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US3955015A
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US4143218A
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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) | 1984-08-10 | 1985-02-09 | 1985-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-10 | 1989-02-09 | 1989-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-10 | 1993-02-09 | 1993-08-11 | $7700.00 | Window Closed / Lapsed |