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US4584248A
Expired / Lapsed
US
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Sealed lead-acid secondary cell
Assignee: Japan Storage Battery Co Ltd
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Filing: 1984-10-03
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Granted: 1986-04-22
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Expires: 2004-10-03
Abstract
Abstract A sealed lead-acid secondary cell of the type that absorbs oxygen by the negative electrode, is characterized in that a porous member impregnated with a liquid substance is disposed within or outside of a safety valve, or in contact with the bottom of said safety valve.
Inventors
- 👤 Masashi Iwata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 10:06
CPC Classifications
H; H01; H01M; H01M50/00; H01M50/30; H01M50/317; H01M50/325; H01M50/383; H01M50/394; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
65 words
A sealed lead-acid secondary cell of the type that absorbs oxygen by the negative electrode, characterized in that a cylindrical safety valve having side walls and a closed end is provided to cover a cylindrical valve seat such that said side wall surrounds said valve seat and a tubular porous member impregnated with an oxidation retardant liquid substance is in contact with said safety valve.
Claim 2
Dependent Claim
65 words
A sealed lead-acid secondary cell of the type that absorbs oxygen by the negative electrode, characterized in that a cylindrical safety valve having side walls and a closed end is provided to cover a cylindrical valve seat such that said side wall surrounds said valve seat and a tubular porous member impregnated with an oxidation retardant liquid substance is in contact with said safety valve.
Claim 3
Dependent Claim
66 words
A sealed lead-acid secondary cell of the type that absorbs oxygen by the negative electrode, characterized in that a cylindrical safety valve having side-walls and a closed end is provided to cover a cylindrical valve seat wherein said side walls have an annular indentation on an interior surface thereof and a porous material impregnated with an oxidation retardant liquid substance is inserted in said annular indentation.
Claim 4
Dependent Claim
66 words
A sealed lead-acid secondary cell of the type that absorbs oxygen by the negative electrode, characterized in that a cylindrical safety valve having side-walls and a closed end is provided to cover a cylindrical valve seat wherein said side walls have an annular indentation on an interior surface thereof and a porous material impregnated with an oxidation retardant liquid substance is inserted in said annular indentation.
Claim 5
Dependent Claim
36 words
A cell as calimed in claim 1, wherein said tubular porpous member is positioned below said safety valve and is further surrounded by a barrier member so as to prevent a leakage of said liquid substance.
Claim 6
Dependent Claim
28 words
A cell as claimed in claim 1 or 2, wherein said cell has a detachably mounted explosion-preventing filter which has said safety valve disposed in the interior thereof.
Claim 7
Dependent Claim
20 words
A cell as claimed in claim 1 or 2, wherein two or more safety valves are arranged in series connection.
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) | 1989-04-21 | 1989-10-21 | 1990-04-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-21 | 1993-10-21 | 1994-04-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-21 | 1997-10-21 | 1998-04-22 | $7700.00 | Window Closed / Lapsed |