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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 02:33
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
US4125680A Cited
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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