US3607408A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Dry-charged lead acid storage battery having partially recharged electrodes and method
Assignee: ESB Inc
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Filing: 1969-11-05
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Granted: 1971-09-21
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Expires: 1989-11-05
Abstract
Abstract A dry-charged lead acid storage battery has partially recharged electrodes which serve as a source of sulfate ions. An additional source of sulfate ions is also inside the battery container. In contrast to the partially or fully discharged electrodes in previous dry batteries, the electrodes of this invention are characterized by having active material in which the percent of lead sulfate in the active material at a specified distance from the center of the electrode grid decreases as the specified distance of the material from the grid decreases. These improved electrodes are produced by being fully charged, then completely discharged, then partially recharged, and then washed and dried.
Inventors
- 👤 Joseph C Duddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:38
CPC Classifications
H; H01; H01M; H01M4/00; H01M4/02; H01M4/14; H01M4/16; H01M4/22; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
151 words
A method of producing a partially charged and dry electrode for a lead acid battery comprising the steps of: a. immersing an electrode having a grid surrounded by lead compound active material comprising PbO into a sulfuric acid solution; b. charging the electrode to a state of substantially full charge; c. discharging the electrode to a state of substantially complete discharge; d. recharging the electrode to a state of partial charge whereby the electrode is characterized by having active material in which the percent of charged active material increases over a specified distance from the center to the exterior of the electrode as the distance from the grid decreases and in which the percent of lead sulfate decreases over a specified distance from the center of the electrode grid to the exterior of the electrode as the distance from the grid decreases; e. washing the electrode; and, f. drying the electrode.
Claim 2
Independent Claim
151 words
A method of producing a partially charged and dry electrode for a lead acid battery comprising the steps of: a. immersing an electrode having a grid surrounded by lead compound active material comprising PbO into a sulfuric acid solution; b. charging the electrode to a state of substantially full charge; c. discharging the electrode to a state of substantially complete discharge; d. recharging the electrode to a state of partial charge whereby the electrode is characterized by having active material in which the percent of charged active material increases over a specified distance from the center to the exterior of the electrode as the distance from the grid decreases and in which the percent of lead sulfate decreases over a specified distance from the center of the electrode grid to the exterior of the electrode as the distance from the grid decreases; e. washing the electrode; and, f. drying the electrode.
Claim 3
Dependent Claim
214 words
A dry-charged lead acid storage battery having a. a container, b. dry positive and negative electrodes within the container which have previously been fully charged, each electrode consisting of a grid surrounded by lead compound active material, the lead compound active material in the positive electrode comprising an oxide of lead-charged material and lead sulfate discharged material and the lead compound active material in the negative electrode comprising lead charged material and lead sulfate discharged material, c. a source of sulfate ions inside the container which is in addition to the electrodes, d. a cover on the container, and e. means for conducting electrical current between the exterior of the container and the positive electrodes and additional means for conducting electrical current between the exterior of the container and the negative electrodes, wherein the improvement comprises: each of the positive and negative electrodes characterized by having active material in which the percent of charged active material increases over a specified distance from the center of the electrode grid to the exterior of the electrode as the distance from the grid decreases and in which the percent of lead sulfate decreases over a specified distance from the center of the electrode grid to the exterior of the electrode as the distance from the grid decreases.
Claim 4
Dependent Claim
214 words
A dry-charged lead acid storage battery having a. a container, b. dry positive and negative electrodes within the container which have previously been fully charged, each electrode consisting of a grid surrounded by lead compound active material, the lead compound active material in the positive electrode comprising an oxide of lead-charged material and lead sulfate discharged material and the lead compound active material in the negative electrode comprising lead charged material and lead sulfate discharged material, c. a source of sulfate ions inside the container which is in addition to the electrodes, d. a cover on the container, and e. means for conducting electrical current between the exterior of the container and the positive electrodes and additional means for conducting electrical current between the exterior of the container and the negative electrodes, wherein the improvement comprises: each of the positive and negative electrodes characterized by having active material in which the percent of charged active material increases over a specified distance from the center of the electrode grid to the exterior of the electrode as the distance from the grid decreases and in which the percent of lead sulfate decreases over a specified distance from the center of the electrode grid to the exterior of the electrode as the distance from the grid decreases.
References Cited (Backward Citations)
US3447969A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-20 | 1975-03-22 | 1975-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-20 | 1979-03-22 | 1979-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-20 | 1983-03-22 | 1983-09-21 | $7700.00 | Window Closed / Lapsed |