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Patent US4547443A successfully refreshed from Google Patents.
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US4547443A Expired / Lapsed US ⏱️ 0.0 years remaining

Unitary plate electrode

Assignee: Atlantic Richfield Co
•
Filing: 1983-11-14
•
Granted: 1985-10-15
•
Expires: 2003-11-14
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Abstract

Abstract The unitary electrode (10) comprises a porous sheet (12) of fiberglass the strands (14) of which contain a coating (16) of conductive tin oxide. The lower portion of the sheet contains a layer (18) of resin and the upper layer (20) contains lead dioxide forming a positive active electrode on an electrolyte-impervious layer. The strands (14) form a continuous conduction path through both layers (16, 18). Tin oxide is prevented from reduction by coating the surface of the plate facing the negative electrode with a conductive, impervious layer resistant to reduction such as a thin film (130) of lead or graphite filled resin adhered to the plate with a layer (31) of conductive adhesive. The plate (10) can be formed by casting a molten resin from kettle (60) onto a sheet of glass wool (56) overlying a sheet of lead foil and then applying positive active paste from hopper (64) into the upper layer (68). The plate can also be formed by passing an assembly of a sheet ( 80) of resin, a sheet (86) of sintered glass and a sheet (90) of lead between the nip (92) of heated rollers (93, 95) and then filling lead oxide into the pores (116) of the upper layer (118).

Inventors

  • 👤 John J. Rowlette
  • 👤 Thomas J. Clough
  • 👤 Jack Y. Josefowicz
  • 👤 John W. Sibert

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-30 15:05
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/14; H01M4/64; Y; Y02; Y02E; Y02E60/00; Y02E60/10

Claims Analysis

Total Claims: 19
Claim 1
Independent Claim 74 words
A plate for a lead-acid battery comprising: a porous body formed of a substrate having a surface layer of conductive tin oxide that is thermodynamically stable during charge and discharge of said battery; a first layer of matrix resin impregnated into the pores of the body to form a conductive, fluid impervious, first layer; a second layer adjacent to the first layer containing electrochemically active lead oxide material in the pores of the body.
Claim 2
Dependent Claim 74 words
A plate for a lead-acid battery comprising: a porous body formed of a substrate having a surface layer of conductive tin oxide that is thermodynamically stable during charge and discharge of said battery; a first layer of matrix resin impregnated into the pores of the body to form a conductive, fluid impervious, first layer; a second layer adjacent to the first layer containing electrochemically active lead oxide material in the pores of the body.
Claim 3
Dependent Claim 12 words
A plate according to claim 1, in which the substrate is glass.
Claim 4
Dependent Claim 17 words
A plate according to claim 2, in which the tin oxide is coated onto a particulate substrate.
Claim 5
Dependent Claim 23 words
A plate according to claim 2, in which the substrate is in the form of powder, filaments, fibers or a sintered porous sheet.
Claim 6
Dependent Claim 24 words
A plate according to claim 4, in which the substrate is a glass fiber having a diameter from about 1 to about 20 microns.
Claim 7
Dependent Claim 22 words
A plate according to claim 5, in which the tin oxide layer has a thickness from 0.01 micron to about 10 microns.
Claim 8
Dependent Claim 29 words
A plate according to claim 6, in which the coated fibers are present in the matrix resin layer in an amount from about 20% to about 80% by weight.
Claim 9
Dependent Claim 20 words
A plate according to claim 7, in which the fibers are in the form of a sheet of glass wool.
Claim 10
Dependent Claim 18 words
A plate according to claim 7, in which the fibers are in the form of a woven fabric.
Claim 11
Dependent Claim 13 words
A plate according to claim 7, in which the resin is a polyolefin.
Claim 12
Dependent Claim 12 words
A plate according to claim 10, in which the resin is polypropylene.
Claim 13
Dependent Claim 21 words
A plate according to claim 1, in which the first layer has a thickness from about 1 to about 20 mils.
Claim 14
Dependent Claim 18 words
A plate according to claim 1, in which the pores of the second layer contains lead oxide paste.
Claim 15
Dependent Claim 26 words
A plate according to claim 1, further including a third fluid-impervious conductive layer that is resistent to reduction applied to the surface of the first layer.
Claim 16
Dependent Claim 16 words
A plate according to claim 14, further including a negative electrode applied to the third layer.
Claim 17
Dependent Claim 29 words
A plate according to claim 15, in which the conductive layer is selected from thin films of metal and a film or resin containing a dispersion of conductive particles.
Claim 18
Dependent Claim 17 words
A plate according to claim 16, in which the particles are fibers selected from lead or graphite.
Claim 19
Dependent Claim 23 words
A plate according to claim 14 in which the negative electrode includes a negative active paste containing lead associated with the third layer.

References Cited (Backward Citations)

US3202545A Cited
US3466193A Cited
US3738871A Cited
US3819412A Cited
US4098967A Cited
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US4275130A Cited
US4339322A Cited
US4326017A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1988-10-14 1989-04-15 1989-10-15 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1992-10-14 1993-04-15 1993-10-15 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1996-10-14 1997-04-15 1997-10-15 $7700.00 Window Closed / Lapsed

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