Patent US3973992A successfully refreshed from Google Patents.
US3973992A
Expired / Lapsed
US
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Tubular electrode
Assignee: VARTA Batterie AG
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Filing: 1974-05-28
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Granted: 1976-08-10
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Expires: 1994-05-28
Abstract
Abstract An electrode grid is formed of extruded spines onto whose ends a yoke is cast. The spines may be of lead or lead alloy, with a core of a more highly conductive material.
Inventors
- 👤 Hans Krug
- 👤 Hans Niklas
- 👤 Rolf Thornblad
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 09:14
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/70; H01M4/76; H01M4/765; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
121 words
The method of making a tubular electrode which electrode includes an array of grid spines and a yoke joining the ends of said spines through which the electrode current is taken off, said method comprising the steps of: forming a plurality of separate ones of said spines by extruding low antimony-content lead through a die; arraying the separate spines to form a grid, with adjacent ends of the different spines protruding into the hollow interior of a casting mold conforming to the shape of the yoke; filling the yoke-conforming interior of the mold with liquid low antimony-content lead, thereby to cast the yoke into the protruding spine ends; and removing the spine array and cast-on yoke from the mold after hardening.
Claim 2
Independent Claim
121 words
The method of making a tubular electrode which electrode includes an array of grid spines and a yoke joining the ends of said spines through which the electrode current is taken off, said method comprising the steps of: forming a plurality of separate ones of said spines by extruding low antimony-content lead through a die; arraying the separate spines to form a grid, with adjacent ends of the different spines protruding into the hollow interior of a casting mold conforming to the shape of the yoke; filling the yoke-conforming interior of the mold with liquid low antimony-content lead, thereby to cast the yoke into the protruding spine ends; and removing the spine array and cast-on yoke from the mold after hardening.
Claim 3
Dependent Claim
57 words
The method of claim 1 wherein the extruding of the spines includes introducing wire of higher electrical conductivity and lower weight than lead through an injection nozzle into a cavity containing the lead in molten state, drawing the wire out again through an aperture wider than the injection nozzle, and cooling the material emerging from the aperture.
Claim 4
Dependent Claim
31 words
The method of claim 1 further comprising maintaining the arrayed spines surrounded with material providing heat insulation from the mold during the time the spine ends protrude into the mold interior.
Claim 5
Dependent Claim
9 words
The electrode made by the method of claim 1.
Claim 6
Dependent Claim
9 words
The electrode made by the method of claim 2.
Claim 7
Dependent Claim
9 words
The electrode made by the method of claim 3.
Claim 8
Dependent Claim
15 words
An electrode according to claim 4, wherein said spines are at least 1000 mm long.
Claim 9
Dependent Claim
18 words
An electrode according to claim 4, wherein said spines are joined to said joke without any substantial voids.
Claim 10
Dependent Claim
23 words
An electrode according to claim 4, wherein said spines are formed of a lead alloy having substantially less than 9% antimony by weight.
Claim 11
Dependent Claim
17 words
An electrode according to claim 9, wherein said alloy has approximately 3 to 3.5% antimony by weight.
Claim 12
Dependent Claim
21 words
The electrode of claim 4, wherein said spines extend into said cast-on yoke to a depth of only about 2 mm.
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) | 1979-08-10 | 1980-02-09 | 1980-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-10 | 1984-02-09 | 1984-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-10 | 1988-02-09 | 1988-08-10 | $7700.00 | Window Closed / Lapsed |