Patent US4258108A successfully refreshed from Google Patents.
US4258108A
Expired / Lapsed
US
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Leak-proofing of button cells
Assignee: VARTA Batterie AG
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Filing: 1980-04-14
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Granted: 1981-03-24
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Expires: 2000-04-14
Abstract
Abstract Galvanic elements of button cell type are sealed against electrolyte escape by positioning a hydroxide binding material between the housing cup and the lid on that side of the synthetic plastic seal which is normally sealed off from contact with the electrolyte. This material can be positioned within a ring of matting which is protected from moisture by a coating of lacquer or a shrink tube. The hydroxide binding material for which solids such as B 2 O 3 , As 2 O 3 or acid salts such as NaH 2 PO 4 , Na 2 H 2 P 2 O 7 may be used, may also be positioned in encircling grooves provided in the sealing body itself.
Inventors
- 👤 Helmut Glaser
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 15:31
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/34; H01M50/00; H01M50/10; H01M50/147; H01M50/166; H01M50/171; H01M50/183; H01M50/184; H01M50/186; H01M50/19; H01M50/193; H01M50/197; H01M50/167; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
54 words
A galvanic element, particularly a button cell, having an alkaline electrolyte in a metal housing which is sealed in gas-tight manner by means of a synthetic plastic seal between the housing cup and the lid and comprising a hydroxide binding material positioned on the side of the sealing region facing away from the electrolyte.
Claim 2
Dependent Claim
54 words
A galvanic element, particularly a button cell, having an alkaline electrolyte in a metal housing which is sealed in gas-tight manner by means of a synthetic plastic seal between the housing cup and the lid and comprising a hydroxide binding material positioned on the side of the sealing region facing away from the electrolyte.
Claim 3
Dependent Claim
17 words
The element of claim 1 wherein the hydroxide binding material is a water soluble, acidically reacting solid.
Claim 4
Dependent Claim
11 words
The element of claim 2 wherein the material is boric acid.
Claim 5
Dependent Claim
18 words
The element of claim 2 wherein the material is an acidic alkali salt of a multibasic inorganic acid.
Claim 6
Dependent Claim
11 words
The element of claim 2 wherein the material is ascorbic acid.
Claim 7
Dependent Claim
28 words
The element of claim 1 wherein the hydroxide binding material is contained within a ring of matting which is positioned on the outer side of the sealing region.
Claim 8
Dependent Claim
15 words
The element of claim 6 wherein the ring of matting is covered in liquid-excluding manner.
Claim 9
Dependent Claim
13 words
The element of claim 7 wherein the covering is provided by shrink tubing.
Claim 10
Dependent Claim
20 words
The element of claim 1 wherein the hydroxide binding material is positioned in grooves which encircle the synthetic plastic seal.
Claim 11
Dependent Claim
21 words
The element of claim 9 wherein the synthetic plastic seal extends into a region below the inner surface of the lid.
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) | 1984-03-23 | 1984-09-22 | 1985-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-23 | 1988-09-22 | 1989-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-23 | 1992-09-22 | 1993-03-24 | $7700.00 | Window Closed / Lapsed |