US3679976A
Expired / Lapsed
US
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Elapsed time indicator having color indication
Assignee: Japan Radio Co Ltd
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Filing: 1971-03-23
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Granted: 1972-07-25
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Expires: 1991-03-23
Abstract
Abstract The anode electrode of an elapsed time indicator includes an elapsed time measuring metallic element superposed on a coloring metallic element, the normal electrode potential of the coloring element being higher than that of the elapsed time measuring element, and lower than the electrolyzing potential of the electrolytic solution, so that electrolysis of the elapsed time measuring element precedes that of the coloring element. The electrolytic solution contains a substance which reacts with the coloring element on electrolysis thereof to change the color of the electrolytic solution, thereby indicating the elapsed time.
Inventors
- 👤 Juro Ogawa
- 👤 Fujimoto Yoshiaki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:34
CPC Classifications
G; G04; G04F; G04F13/00; G01; G01R; G01R22/00; G01R22/04; G07; G07C; G07C3/00; G07C3/02
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
27 words
The indicator of claim 1, wherein said envelope contains at least one bubble in said electrolytic solution to inhibit the increase of internal pressure in said envelope.
Claim 2
Dependent Claim
30 words
The indicator of claim 1, wherein said envelope comprises at least one mass of foamed material in said electrolytic solution to inhibit the increase of internal pressure in said envelope.
Claim 3
Dependent Claim
21 words
The indicator of claim 1, comprising a rubber-like material, which is at least semi-transparent, coating the outer surface of said envelope.
Claim 4
Dependent Claim
57 words
The indicator of claim 1, wherein an alloy junction region with a thickness of about 20 A. is formed between the contact surfaces of said elapsed time measuring element and the coloring metallic element, said first and second anode metallic elements being electrolyzed selectively at different times with an electrolyzing current density of 0.01 to 1.0 A/dm2.
Claim 5
Dependent Claim
30 words
The indicator of claim 1, wherein said electrolytic solution contains a ligand forming a deep-colored complex in reaction with the coloring metal ions produced by electrolyzing said coloring metallic element.
Claim 6
Dependent Claim
33 words
The indicator of claim 6 wherein said electrolytic solution contains an organic compound having a small molecular weight selected from the group consisting of acetone, methanol, ethanol, and ether, as an auxochromic agent.
Claim 7
Dependent Claim
29 words
The indicator of claim 6, wherein said coloring metallic anode element is at least one element selected from the group consisting of iron, nickel, cobalt, chromium, manganese and copper.
Claim 8
Dependent Claim
31 words
The indicator of claim 6, wherein said elapsed time measuring metallic anode element is at least one element selected from the group consisting of iron, nickel, copper, zinc, cadmium and tin.
Claim 9
Dependent Claim
34 words
The indicator of claim 1, wherein said electrolytic solution includes a discoloring agent to discolor or color said electrolytic solution in reaction with the coloring metal ions produced by electrolyzing said coloring metallic element.
Claim 10
Dependent Claim
27 words
The indicator of claim 10, wherein said coloring metallic anode element is at least one element selected from the group consisting of copper, silver, cobalt and iron.
Claim 11
Dependent Claim
28 words
The indicator of claim 10, wherein said elapsed time measuring metallic anode element is at least one element selected from the group consisting of zinc, tin and cadmium.
Claim 12
Dependent Claim
24 words
The indicator of claim 10, wherein said discoloring agent comprises at least one material selected from the group consisting of salicylic acid or nitroso-R-salt.
References Cited (Backward Citations)
US2910647A
Cited
US3045179A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-25 | 1976-01-24 | 1976-07-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-25 | 1980-01-24 | 1980-07-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-25 | 1984-01-24 | 1984-07-25 | $7700.00 | Window Closed / Lapsed |