Patent US4326017A successfully refreshed from Google Patents.
US4326017A
Expired / Lapsed
US
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Positive electrode for lead acid battery
Assignee: Hawker Energy Products Inc
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Filing: 1981-01-26
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Granted: 1982-04-20
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Expires: 2001-01-26
Abstract
Abstract A positive electrode for use in a lead-sulfuric acid electrolyte battery comprised of a grid supporting a layer of PbO 2 , said grid being comprised of an electrically conducting substrate having an adherent, contacting, at least substantially pinhole-free coating of semiconducting metal oxide, the sulfuric acid electrolyte having no significant deleterious effect on the coating and forming a non-corroding oxide with the substrate at sites of pinholes.
Inventors
- 👤 Fritz G. Will
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:43
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/64; H01M4/66; H01M4/68; H01M4/14; H01M4/16; H01M4/20; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
68 words
A positive electrode for use in a secondary lead-sulfuric acid electrolyte cell or battery comprised of a grid supporting an adherent external layer of PbO 2 , said grid being comprised of an electrically conducting substrate having an at least substantially pinhole-free coating of semiconducting metal oxide, the sulfuric acid electrolyte having no significant deleterious effect on the coating and forming a substantially non-corroding oxide with the substrate.
Claim 2
Dependent Claim
68 words
A positive electrode for use in a secondary lead-sulfuric acid electrolyte cell or battery comprised of a grid supporting an adherent external layer of PbO 2 , said grid being comprised of an electrically conducting substrate having an at least substantially pinhole-free coating of semiconducting metal oxide, the sulfuric acid electrolyte having no significant deleterious effect on the coating and forming a substantially non-corroding oxide with the substrate.
Claim 3
Dependent Claim
28 words
The positive electrode according to claim 1 wherein said substrate is selected from the group consisting of titanium, niobium, tantalum, tungsten, molybdenum, zirconium, silicon, tin and alloys thereof.
Claim 4
Dependent Claim
39 words
The positive electrode according to claim 1 wherein said semiconducting metal oxide is selected from the group consisting of SnO 2 , Nb 2 O 5 , TiO 2 , Ta 2 O 5 , and WO 3 .
Claim 5
Dependent Claim
60 words
The positive electrode according to claim 1 wherein said substrate has an electrical conductivity at room temperature ranging from about 10 2 ohm -1 cm -1 up to about 10 6 ohm -1 cm -1 , and said semiconducting metal oxide has a minimum electrical conductivity at room temperature of at least about 10 -5 ohm -1 cm -1 .
Claim 6
Dependent Claim
27 words
The positive electrode according to claim 1 wherein the thickness of said coating of semiconducting metal oxide ranges from about 30 Angstroms up to about 100,000 Angstroms.
Claim 7
Dependent Claim
23 words
The positive electrode according to claim 1 wherein said substrate has a thickness ranging from about 0.01 millimeter up to about 10 millimeters.
Claim 8
Dependent Claim
55 words
The positive electrode according to claim 1 wherein said external layer of PbO 2 is at least significantly porous and wherein there is a layer of PbO 2 intermediate to said coating of semiconducting metal oxide and said external layer of PbO 2 , said intermediate layer of PbO 2 being at least significantly non-porous.
Claim 9
Dependent Claim
47 words
A positive electrode for use in a secondary lead-sulfuric acid electrolyte cell or battery comprised of a grid supporting an adherent external layer of PbO 2 , said grid being comprised of a titanium substrate having an adherent at least substantially pin-hole free coating of stannic oxide.
Claim 10
Dependent Claim
47 words
A positive electrode for use in a secondary lead-sulfuric acid electrolyte cell or battery comprised of a grid supporting an adherent external layer of PbO 2 , said grid being comprised of a titanium substrate having an adherent at least substantially pin-hole free coating of stannic oxide.
Claim 11
Dependent Claim
54 words
The positive electrode according to claim 8 wherein said external layer of PbO 2 is at least significantly porous and wherein there is a layer of PbO 2 intermediate to said coating of stannic oxide and said external layer of PbO 2 , said intermediate layer of PbO 2 being at least significantly non-porous.
References Cited (Backward Citations)
US3870563A
Cited
US4037031A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-04-19 | 1985-10-19 | 1986-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-04-19 | 1989-10-19 | 1990-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-04-19 | 1993-10-19 | 1994-04-20 | $7700.00 | Window Closed / Lapsed |