US4835476A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage measuring sheet
Assignee: Three Tec Davis Inc
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Filing: 1986-11-28
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Granted: 1989-05-30
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Expires: 2006-11-28
Abstract
Abstract A voltage measuring sheet which is capable of qualitatively measuring the existing strength of condition of batteries has an electrically conductive layer and a temperature-sensitive decoloring type coloring layer which are provided on a transparent substrate. The sheet further has contacts defined by the conductive layer which are brought into contact with two electrodes, respectively, of a battery which is to be measured. In addition, a scale pattern is disposed underneath the coloring layer. Thus, it is possible to simplify the arrangement and hence production of the sheet and facilitate the reading of indication on the sheet.
Inventors
- 👤 Kunisaku Kurosawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 13:08
CPC Classifications
H; H01; H01M; H01M10/00; H01M10/42; H01M10/48; H01M10/488; H01M6/00; H01M6/50; H01M6/5044; H01M6/505; Y; Y02; Y02E; Y02E60/00; Y02E60/10
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
85 words
A voltage measuring sheet consisting essentially of: a substrate; a first layer of an electrically conductive material provided on a portion of said substrate; a second layer of a temperature-sensitive decoloring type coloring agent provided on a portion of said substrate; and a scale pattern disposed underneath said second layer of coloring agent, whereby the heat generated in the first layer of conductive material causes a change in color of the second layer of the coloring agent so as to be observed through the substrate.
Claim 2
Dependent Claim
85 words
A voltage measuring sheet consisting essentially of: a substrate; a first layer of an electrically conductive material provided on a portion of said substrate; a second layer of a temperature-sensitive decoloring type coloring agent provided on a portion of said substrate; and a scale pattern disposed underneath said second layer of coloring agent, whereby the heat generated in the first layer of conductive material causes a change in color of the second layer of the coloring agent so as to be observed through the substrate.
Claim 3
Dependent Claim
42 words
A voltage measuring sheet according to claim 1, particularly designed to test the strength of batteries, in which the substrate is transparent and the temperature-sensitive decoloring agent changes color by becoming transparent substantially proportional to a voltage output of the battery tested.
Claim 4
Dependent Claim
54 words
A voltage measuring sheet according to claim 2 where the second layer of temperature-sensitive decoloring agent consists essentially of a mixture of a crystal violet lactone dye, a nonyl phenol developer and N-myristyl alcohol as a wax, whereby the decoloring agent has a bluish color at room temperature and becomes transparent at 40° C.
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) | 1992-05-29 | 1992-11-28 | 1993-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-05-29 | 1996-11-28 | 1997-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-05-29 | 2000-11-28 | 2001-05-30 | $7700.00 | Window Closed / Lapsed |