Patent US4078123A successfully refreshed from Google Patents.
US4078123A
Expired / Lapsed
US
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Spiral-wrapped multi-layer cell separator
Assignee: VARTA Batterie AG
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Filing: 1976-12-23
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Granted: 1978-03-07
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Expires: 1996-12-23
Abstract
Abstract Inner and outer spiral-wrapped layers with adhesive between them form a sleeve. The adhesive is then activated. The outer layer covers at least the adjoining edges of the inner layer.
Inventors
- 👤 Ullrich Costenoble
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 06:15
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/40; H01M50/463; H01M50/469; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
134 words
The method of manufacturing a separator sleeve for a galvanic element, comprising: spirally wrapping upon a mandrel an inner layer of separator foil, spirally wrapping directly upon said inner layer so as to cover at least the adjoining edges of the inner layer an intermediate layer of a synthetic plastic foil which is substantially solid and non-adhesive in the state in which it is wrapped but which is soluble and becomes adhesive without the application of external pressure or heat in response to an activating liquid, spirally wrapping directly upon the intermediate layer an outer layer of separator foil, and applying said activating liquid in the absence of external pressure or heat, whereby the intermediate layer becomes adhesive and securely joins the inner and outer layers without the application of external pressure or heat.
Claim 2
Independent Claim
134 words
The method of manufacturing a separator sleeve for a galvanic element, comprising: spirally wrapping upon a mandrel an inner layer of separator foil, spirally wrapping directly upon said inner layer so as to cover at least the adjoining edges of the inner layer an intermediate layer of a synthetic plastic foil which is substantially solid and non-adhesive in the state in which it is wrapped but which is soluble and becomes adhesive without the application of external pressure or heat in response to an activating liquid, spirally wrapping directly upon the intermediate layer an outer layer of separator foil, and applying said activating liquid in the absence of external pressure or heat, whereby the intermediate layer becomes adhesive and securely joins the inner and outer layers without the application of external pressure or heat.
Claim 3
Dependent Claim
16 words
The method of claim 1 wherein both the inner and outer layers are of microporous foil.
Claim 4
Dependent Claim
22 words
The method of claim 1 wherein the inner layer is a pore-free foil and the outer layer is an absorbent mircroporous foil.
Claim 5
Dependent Claim
17 words
The method of claim 1 wherein the synthetic foil forming the intermediate layer is of polyvinyl alcohol.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein the foil forming the intermediate layer is of cellulose derivative.
Claim 7
Dependent Claim
10 words
The separator sleeve manufactured by the method of claim 1.
Claim 8
Dependent Claim
20 words
A galvanic primary element including the separator sleeve of claim 6 and positive and negative electrodes separated by the sleeve.
Claim 9
Dependent Claim
17 words
The element of claim 7 wherein the outer absorbent layer of the sleeve contains an alkaline electrolyte.
Claim 10
Dependent Claim
18 words
The method of claim 1 wherein the liquid is applied by spraying after wrapping of the outer layer.
References Cited (Backward Citations)
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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) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |