US4122133A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Material for an alkaline cell separator and a process of making
Assignee: ESB Inc
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Filing: 1977-03-23
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Granted: 1978-10-24
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Expires: 1997-03-23
Abstract
Abstract A material useful as a separator in batteries and a process for making the material is provided. This material is a polyolefin having grafted to it side chains derived from an ethylenically unsaturated ionogenic monomer and cross-linked with sulfur.
Inventors
- 👤 Philip Bernstein
- 👤 James P. Coffey
- 👤 Alan E. Varker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:17
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/28; C08F; C08F255/00; H; H01; H01M; H01M50/00; H01M50/40; H01M50/409; H01M50/411; H01M50/414; H01M50/417; H01M50/42; H01M50/44; C08J2351/00; H01M2300/00; H01M2300/0002; H01M2300/0014; H01M50/443; H01M50/489; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
17 words
A material comprised of a polyolefin having ethylenically unsaturated ionogenic monomers grafted thereon and cross-linked with sulfur.
Claim 2
Dependent Claim
17 words
A material comprised of a polyolefin having ethylenically unsaturated ionogenic monomers grafted thereon and cross-linked with sulfur.
Claim 3
Dependent Claim
10 words
The material of claim 1 wherein the polyolefin is polyethylene.
Claim 4
Dependent Claim
17 words
The material of claim 1 wherein the ethylenically unsaturated ionogenic monomer is acrylic acid or methacrylic acid.
Claim 5
Dependent Claim
19 words
The material of claim 1 wherein the polyolefin is polyethylene and the ethylenically unsaturated ionogenic monomer is methacrylic acid.
Claim 6
Dependent Claim
27 words
A separator for an alkaline cell comprised of a film of a polyolefin having grafted thereto side chains of ethylenically unsaturated ionogenic monomers and cross-linked with sulfur.
Claim 7
Dependent Claim
27 words
A separator for an alkaline cell comprised of a film of a polyolefin having grafted thereto side chains of ethylenically unsaturated ionogenic monomers and cross-linked with sulfur.
Claim 8
Dependent Claim
16 words
The separator of claim 5 wherein the polyolefin is polyethylene and the monomer is methacrylic acid.
Claim 9
Dependent Claim
32 words
The separator of claim 5 wherein the polyolefin is polyethylene and the monomer is methacrylic acid, having a level of graft polymerization of 30 to 440% based on the weight of polyethylene.
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) | 1981-10-23 | 1982-04-24 | 1982-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-10-23 | 1986-04-24 | 1986-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-10-23 | 1990-04-24 | 1990-10-24 | $7700.00 | Window Closed / Lapsed |