Patent US3864169A successfully refreshed from Google Patents.
US3864169A
Expired / Lapsed
US
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A method for making laminated electrodes
Assignee: NL Industries Inc
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Filing: 1974-03-25
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Granted: 1975-02-04
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Expires: 1994-03-25
Abstract
Abstract A light-weight lead-acid battery has been prepared which contains a novel light weight electrode having at least three plies, the center ply being a conductive sheet and the outer two plies being sheets of porous, compressed and sintered homogeneous composite of synthetic fibers and lead oxide powder material. This application is also directed toward a method for preparing laminated electrodes and the light-weight battery which uses these electrodes.
Inventors
- 👤 John P Cestaro
- 👤 Uriel Sokolov
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 03:00
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/04; H01M4/0402; H01M4/0404; H01M4/043; H01M4/0435; H01M4/0471; H01M4/14; Y; Y02; Y02E; Y02E60/00; Y02E60/10; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24273; Y10T428/24322; Y10T428/24331; Y10T428/30
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
97 words
A METHOD FOR MAKING A COMPOSITE SHEET OF A LOOSE HOMOGENEOUS MAT OF SYNTHETIC FIBERS COATED WITH A POWDERED ACTIVE MATERIAL SAID COMPOSITE SHEET USEFUL FOR FORMING A LAMINATED ELECTRODE WHICH COMPRISES DISPERSING SYNTHETIC FIBERS IN WATER WITH AGITATION TO FORM A SLURRY, ADDING POWDERED ACTIVE MATERIAL TO SAID SLURRY AND AFTER THROUGHLY MIXING, FLOCCULATING THE DISPERSED SLURRY BY LOWERING THE PH UNTIL A LARGE FLOCCULATED MASS OF FIBERS AND ACTIVE MATERIAL IS FORMED, FILTERING AND DRYING SAID FLOCCULATED MASS TO FORM A COMPOSITE SHEET OF A LOOSE HOMOGENEOUS MAT OF FIBERS COATED WITH SAID ACTIVE MATERIAL.
Claim 2
Independent Claim
97 words
A METHOD FOR MAKING A COMPOSITE SHEET OF A LOOSE HOMOGENEOUS MAT OF SYNTHETIC FIBERS COATED WITH A POWDERED ACTIVE MATERIAL SAID COMPOSITE SHEET USEFUL FOR FORMING A LAMINATED ELECTRODE WHICH COMPRISES DISPERSING SYNTHETIC FIBERS IN WATER WITH AGITATION TO FORM A SLURRY, ADDING POWDERED ACTIVE MATERIAL TO SAID SLURRY AND AFTER THROUGHLY MIXING, FLOCCULATING THE DISPERSED SLURRY BY LOWERING THE PH UNTIL A LARGE FLOCCULATED MASS OF FIBERS AND ACTIVE MATERIAL IS FORMED, FILTERING AND DRYING SAID FLOCCULATED MASS TO FORM A COMPOSITE SHEET OF A LOOSE HOMOGENEOUS MAT OF FIBERS COATED WITH SAID ACTIVE MATERIAL.
Claim 3
Dependent Claim
20 words
Method according to claim 1 in which the fibers used are selected from the group consisting of polyethylene and polypropylene.
Claim 4
Dependent Claim
23 words
Method according to claim 1 in which 90 percent to 100 percent of the fibers used are synthetic, the remainder being natural fibers.
Claim 5
Dependent Claim
35 words
Method according to claim 1 in which the fibers used are of size such that the numerical product of the length of the fibers in millimeters multiplied by the denier is no greater than 25.
Claim 6
Dependent Claim
30 words
Method according to claim 1 in which the powdered active material used is selected from the group consisting of PbO, Pb, tribasic lead sulfate, tetrabasic lead sulfate, and mixtures thereof.
Claim 7
Dependent Claim
30 words
Method according to claim 1 in which the amount of active material used in the composite sheet is from 50 to 90 parts by weight for each part of fiber.
Claim 8
Independent Claim
128 words
A method for forming a laminated electrode which comprises dispersing synthetic fibers in water with agitation to form a slurry, adding powdered active material to said slurry and after thoroughtly mixing, flocculating the dispersed slurry by lowering the pH until a large flocculated mass of fibers and active material is formed, filtering and drying said flocculated mass to form a composite sheet of a loose homogeneous mat of fibers coated with said active material, placing a composite sheet of said homogeneous mat of fibers coated with said active material on each side of a conductive sheet to form a sandwich and heating and compressing said sandwich at a temperature from 120* to 200 *C under pressure from atmospheric to 13,000 psi to form a three-ply laminated electrode structure.
Claim 9
Independent Claim
128 words
A method for forming a laminated electrode which comprises dispersing synthetic fibers in water with agitation to form a slurry, adding powdered active material to said slurry and after thoroughtly mixing, flocculating the dispersed slurry by lowering the pH until a large flocculated mass of fibers and active material is formed, filtering and drying said flocculated mass to form a composite sheet of a loose homogeneous mat of fibers coated with said active material, placing a composite sheet of said homogeneous mat of fibers coated with said active material on each side of a conductive sheet to form a sandwich and heating and compressing said sandwich at a temperature from 120* to 200 *C under pressure from atmospheric to 13,000 psi to form a three-ply laminated electrode structure.
Claim 10
Dependent Claim
38 words
Method according to claim 7 in which the conductive sheet in said laminated electrode is selected from the group consisting of lead foil, thin perforated lead sheet, paper sheet containing graphite and paper sheet containing lead metal powder.
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) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |