US3282160A
Expired / Lapsed
US
⏱️ 0.0 years remaining
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 17:18
CPC Classifications
G; G02; G02B; G02B5/00; G02B5/20; G02B5/22; G02B5/24; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1516; G02F2001/1517
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
114 words
IN AN ELECTROCHEMICAL LIGHT FILTER HAVING A TRANSPARENT GROSS ELECTRODE, A MINOR ELECTRODE IN SPACED RELATION 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 AQUEOUS SOLUTION HAVING A MAXIMUM PH OF 3 AND CONTAINING THEREIN A COLORING AMOUNT OF COMPLEXED IRON ION STABLE IN AQUEOUS SOLUTION IN THE +2 AND +3 VALANCE STATES WHEREBY THE COLOR OF THE AQUEOUS SOLUTION IS ALTERED BY SEQUENTIALLY APPLYING PULSES OF ELECTRICAL POWER OF OPPOSITE POLARITY.
Claim 2
Dependent Claim
114 words
IN AN ELECTROCHEMICAL LIGHT FILTER HAVING A TRANSPARENT GROSS ELECTRODE, A MINOR ELECTRODE IN SPACED RELATION 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 AQUEOUS SOLUTION HAVING A MAXIMUM PH OF 3 AND CONTAINING THEREIN A COLORING AMOUNT OF COMPLEXED IRON ION STABLE IN AQUEOUS SOLUTION IN THE +2 AND +3 VALANCE STATES WHEREBY THE COLOR OF THE AQUEOUS SOLUTION IS ALTERED BY SEQUENTIALLY 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 |