US3864589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Matrix picture display device using liquid that is reversibly reducible and oxidisable by electric current
Assignee: US Philips Corp
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Filing: 1974-03-04
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Granted: 1975-02-04
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Expires: 1994-03-04
Abstract
Abstract A picture display device comprising a solution of a material which is reversibly reducible and oxidizable by means of an electric current. The electrodes constitute a cross-bar system. The device is divided into a number of non-communicating compartments which are filled with the solution. Each compartment comprises an electrode, which electrodes form a first set. Of a second set of electrodes, each electrode is in contact with the liquid in all the compartments.
Inventors
- 👤 Cornelis Johannes Schoot
- 👤 Johannes Jacobus Ponjee
- 👤 Doorn Rudolf Alexander Van
- 👤 Pieter Tammo Bolwijn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 08:24
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/0102; G02F1/15; G02F1/153; G02F1/1533
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
122 words
A picture display device comprising between two supporting plates of which at least one is transparent a solution of a material which is reversibly reducible and oxidisable by means of an electric current, which solution is in contact with at least two electrodes, characterized in that the space between the two supporting plates comprises a number of elongate noncomMunicating compartments which are filled with the said solution, that an elongate electrode extends in each of the said compartments and belongs to a first set of electrodes and is in contact with liquid in the relevant compartment only, and that the device comprises a second set of elongate electrodes which are each in contact with the liquid in each of the said compartments.
Claim 2
Dependent Claim
122 words
A picture display device comprising between two supporting plates of which at least one is transparent a solution of a material which is reversibly reducible and oxidisable by means of an electric current, which solution is in contact with at least two electrodes, characterized in that the space between the two supporting plates comprises a number of elongate noncomMunicating compartments which are filled with the said solution, that an elongate electrode extends in each of the said compartments and belongs to a first set of electrodes and is in contact with liquid in the relevant compartment only, and that the device comprises a second set of elongate electrodes which are each in contact with the liquid in each of the said compartments.
Claim 3
Dependent Claim
32 words
A picture display device as claimed in claim 1, characterized in that in the case of current passage a local discolouring occurs at the surface of the electrodes of said second set.
Claim 4
Dependent Claim
47 words
A picture display device as claimed in claim 1, characterized in that the electrodes of the said first set are present between a transparent supporting plate and the said second set of electrodes and comprise apertures through which the electrodes of the said second set are visible.
Claim 5
Dependent Claim
32 words
A picture display device as claimed in claim 3, characterized in that the electrodes of the said first set are anodes and that the electrodes of the said second set are cathodes.
References Cited (Backward Citations)
US3500392A
Cited
US3725899A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-02-03 | 1978-08-05 | 1979-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-03 | 1982-08-05 | 1983-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-03 | 1986-08-05 | 1987-02-04 | $7700.00 | Window Closed / Lapsed |