Patent US2971118A successfully refreshed from Google Patents.
Patent US3997366A successfully refreshed from Google Patents.
US3997366A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Battery separators
Assignee: Edgewell Personal Care Brands LLC
•
Filing: 1974-08-23
•
Granted: 1976-12-14
•
Expires: 1994-08-23
Abstract
Abstract A battery separator is provided which is suitable for use in a variety of dry cell systems. The separator comprises a thin carrier of bonded Beta glass fibers coated with partially cross-linked polyacrylamide.
Inventors
- 👤 Charles Davis, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:30
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/489; H01M50/409; H01M50/449; H01M50/451; H01M50/454; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
71 words
A battery separator comprising a layer of electrolyte-immobilizing partially cross-linked polyacrylamide and a carrier for said layer composed of a thin, nonwoven, bonded glass fiber web, containing glass fibers having a diameter of 2 to 8 microns and an individual length of one sixteenth to one half inch, said separator being about 2 to 7 mils in average overall thickness, and said carrier being about 1 to 3 mils in thickness.
Claim 2
Dependent Claim
71 words
A battery separator comprising a layer of electrolyte-immobilizing partially cross-linked polyacrylamide and a carrier for said layer composed of a thin, nonwoven, bonded glass fiber web, containing glass fibers having a diameter of 2 to 8 microns and an individual length of one sixteenth to one half inch, said separator being about 2 to 7 mils in average overall thickness, and said carrier being about 1 to 3 mils in thickness.
Claim 3
Dependent Claim
16 words
A battery separator as defined in claim 1 wherein said electrolyte-immobilizing layer includes a bulking agent.
Claim 4
Dependent Claim
27 words
A battery separator as defined by claim 2 wherein said bulking agent is a mineral silicate selected from the group consisting of talc, fibrous talc, and asbestos.
Claim 5
Dependent Claim
51 words
A battery separator as defined by claim 1 wherein said electrolyte-immobilizing layer additionally includes a chromium-containing compound wherein a major portion of the chromium is present at a valence other than +3, and a compound which will react with said chromium-containing compound to yield chromium ion at a valence of +3.
Claim 6
Dependent Claim
17 words
A battery separator as defined by claim 1 in which said carrier is embedded in said layer.
Claim 7
Dependent Claim
22 words
A battery separator as defined by claim 5 wherein said polyacrylamide electrolyte-immobilizing layer includes a gelled solution of polyacrylamide in aqueous electrolyte.
Claim 8
Dependent Claim
16 words
A battery separator as defined by claim 6 wherein said electrolyte-immobilizing layer includes a bulking agent.
Claim 9
Dependent Claim
27 words
A battery separator as defined by claim 7 wherein said bulking agent is a mineral silicate selected from the group consisting of talc, fibrous talc, and asbestos.
Claim 10
Dependent Claim
14 words
A battery separator as defined by claim 8 wherein said bulking agent is talc.
Claim 11
Dependent Claim
27 words
A battery separator as defined by claim 9 wherein the ratio of said talc to said polyacrylamide is between about 5 to 1 and 10 to 1.
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) | 1979-12-14 | 1980-06-14 | 1980-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-12-14 | 1984-06-14 | 1984-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-12-14 | 1988-06-14 | 1988-12-14 | $7700.00 | Window Closed / Lapsed |