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US3282158A
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Color reversible electrochemical light filter utilizing electrolytic solution
Assignee: Dow Chemical Co
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Filing: 1963-01-07
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Granted: 1966-11-01
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Expires: 1983-01-07
Abstract
No abstract record available.
Inventors
- 👤 Giffin D Jones
- 👤 Ralph E Friedrich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:10
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/24; G02F; G02F1/00; G02F1/01; G02F1/17
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
IN AN ELECTROCHEMICAL LIGHT FILTER HAVING A TRANSPARENG GROSS ELECTRODE, A MINOR ELECTRODE IN SAPCED AND SHIP TO THE GROSS ELECTRODE AND WHICH IS SPACED AND POSITIONED TO ALLOW THE PASSAGE OF LIGHT, A LIGHT TRANSMITTING ELECTROLYTE OCCUPYING THE SPACE BETWEEN SAID ELECTRODES, AN ELECTRICAL POWER SOURCE AND MEANS FOR REVERSIBLY APPLYING SUCH ELECTRICAL POWER TO THE ELECTRODES, THE IMPROVEMENT WHICH COMPRISES PROVIDING AS SAID ELECTROLYTE AN QUEOUS SOLUTION CONTAINING A COLORING AMOUNT OF COMPLEXED COPPER ION STABLE IN QUEOUS SOLUTION IN THE +1 AND +2 VALENCE STATE WHEREBY THE COLOR OF THE AQUEOUS SOLUTION IS ALTERED BY EQUENTIALLY APPLYING PULSES OF ELECTRICAL POWER OF OPPOSITE POLARITY.
Claim 2
Dependent Claim
107 words
IN AN ELECTROCHEMICAL LIGHT FILTER HAVING A TRANSPARENG GROSS ELECTRODE, A MINOR ELECTRODE IN SAPCED AND SHIP TO THE GROSS ELECTRODE AND WHICH IS SPACED AND POSITIONED TO ALLOW THE PASSAGE OF LIGHT, A LIGHT TRANSMITTING ELECTROLYTE OCCUPYING THE SPACE BETWEEN SAID ELECTRODES, AN ELECTRICAL POWER SOURCE AND MEANS FOR REVERSIBLY APPLYING SUCH ELECTRICAL POWER TO THE ELECTRODES, THE IMPROVEMENT WHICH COMPRISES PROVIDING AS SAID ELECTROLYTE AN QUEOUS SOLUTION CONTAINING A COLORING AMOUNT OF COMPLEXED COPPER ION STABLE IN QUEOUS SOLUTION IN THE +1 AND +2 VALENCE STATE WHEREBY THE COLOR OF THE AQUEOUS SOLUTION IS ALTERED BY EQUENTIALLY APPLYING PULSES OF ELECTRICAL POWER OF OPPOSITE POLARITY.
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) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |