US3808522A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of testing the capacity of a lead-acid battery
Assignee: Anderson Power Products Inc
•
Filing: 1972-11-03
•
Granted: 1974-04-30
•
Expires: 1992-11-03
Abstract
Abstract A method of testing the capacity of a lead-acid battery where the internal resistance of the battery is initially measured when the battery is relatively young and the internal resistance is subsequently measured periodically. By comparing the values obtained on these subsequent measurements with the initial value, it is determined when a substantial increase occurs in the internal resistance of the battery. This substantial increase indicates that the battery is near the end of its life.
Inventors
- 👤 H Sharaf
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:27
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/48; G; G01; G01R; G01R27/00; G01R27/02; G01R31/00; G01R31/36; G01R31/378; G01R31/379; G01R31/389; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
84 words
A method of testing the capacity of a load-acid battery comprising the steps of: initially measuring the internal resistance of said battery when the specific gravity of the battery''s electrolyte is greater than 1.150; subsequently measuring the internal resistance of said battery when the specific gravity of the battery''s electrolyte is greater than 1.150; and, comparing the values of the initial and subsequent measurements to ascertain if the value of said subsequent value exceeds the value of said initial value by a predetermined amount.
Claim 2
Independent Claim
84 words
A method of testing the capacity of a load-acid battery comprising the steps of: initially measuring the internal resistance of said battery when the specific gravity of the battery''s electrolyte is greater than 1.150; subsequently measuring the internal resistance of said battery when the specific gravity of the battery''s electrolyte is greater than 1.150; and, comparing the values of the initial and subsequent measurements to ascertain if the value of said subsequent value exceeds the value of said initial value by a predetermined amount.
Claim 3
Dependent Claim
19 words
The method as recited in claim 1 wherein said initial measurement is made when said battery is relatively young.
Claim 4
Dependent Claim
31 words
The method as recited in claim 2 and including recording said initial measurement directly on said battery so that it may be later compared with the value of said subsequent measurement.
Claim 5
Dependent Claim
41 words
The method as recited in claim 2 wherein said predetermined amount by which said subsequent value is to exceed said initial value is about one-half said initial value, thereby indicating that about only 10 percent of said battery''s useful life remains.
Claim 6
Dependent Claim
46 words
The method as recited in claim 2 including periodically repeating said subsequent measuring of the internal resistance of said battery and said comparing of said subsequent values obtained with said iniTial value, until one of said subsequent values exceeds said initial value by a predetermined amount.
References Cited (Backward Citations)
US3676770A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-04-29 | 1977-10-29 | 1978-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-29 | 1981-10-29 | 1982-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-29 | 1985-10-29 | 1986-04-30 | $7700.00 | Window Closed / Lapsed |