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US4033673A
Expired / Lapsed
US
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Erasable visual image display device
Assignee: International Business Machines Corp
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Filing: 1976-05-17
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Granted: 1977-07-05
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Expires: 1996-05-17
Abstract
Abstract An erasable visual image display device contains a pair of conductive electrodes in spaced relationship. One electrode has a cation permselective membrane thereon and the other electrode has an anion permselective membrane thereon. Positioned between the two membranes is a recording medium having the properties of being both photoionizable and capable of electrochemically producing colored species. The medium contains an electrochemically reversible acceptor molecule, for example, 1, 2, 4, 5 tetracyanobenzene and an electrochemically reversible donor molecule, for example, 1-phenyl-3 diethylaminostyrl 5-diethylaminophenyl Δ 2 pyrazoline.
Inventors
- 👤 Hajime Seki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:31
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1514; G02F1/1516
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A visual image display device comprising: a first and a second conductive electrode in spaced-relationship; a cation permselective membrane on said first electrode, an anion permselective membrane on said second electrode, a voltage source and means for selectively applying this voltage between the electrodes to produce an electric field; and a normally light transmitting recording medium occupying the space between said electrodes, said medium having the properties of being both photo-ionizable and capable of electrochemically producing colored species.
Claim 2
Dependent Claim
78 words
A visual image display device comprising: a first and a second conductive electrode in spaced-relationship; a cation permselective membrane on said first electrode, an anion permselective membrane on said second electrode, a voltage source and means for selectively applying this voltage between the electrodes to produce an electric field; and a normally light transmitting recording medium occupying the space between said electrodes, said medium having the properties of being both photo-ionizable and capable of electrochemically producing colored species.
Claim 3
Dependent Claim
14 words
A device as described in claim 1 wherein said medium contains an organic solvent.
Claim 4
Dependent Claim
16 words
A device as described in claim 1 wherein said first and said second electrodes are semitransparent.
Claim 5
Dependent Claim
92 words
A visual image display device comprising: a first and a second conductive electrode in spaced-relationship; a cation permselective membrane on said first electrode, an anion permselective membrane on said second electrode, a voltage source and means for selectively applying this voltage between the electrodes to produce an electric field; and a normally light transmitting recording medium occupying the space between said electrodes, said medium having the properties of being both photo-ionizable and capable of electrochemically producing colored species; said medium contains an electrochemically reversible donor molecule and an electrochemically reversible acceptor molecule.
Claim 6
Dependent Claim
92 words
A visual image display device comprising: a first and a second conductive electrode in spaced-relationship; a cation permselective membrane on said first electrode, an anion permselective membrane on said second electrode, a voltage source and means for selectively applying this voltage between the electrodes to produce an electric field; and a normally light transmitting recording medium occupying the space between said electrodes, said medium having the properties of being both photo-ionizable and capable of electrochemically producing colored species; said medium contains an electrochemically reversible donor molecule and an electrochemically reversible acceptor molecule.
Claim 7
Dependent Claim
28 words
A device as described in claim 4 wherein said donor molecule forms a radical ion adapted to absorb light in the visible spectrum to form the desired color.
Claim 8
Dependent Claim
28 words
A device as described in claim 4 wherein said acceptor molecule forms a radical ion adapted to absorb light in the visible spectrum to form the desired color.
Claim 9
Dependent Claim
32 words
A device as described in claim 4 wherein said acceptor molecule is taken from the group consisting of: 1, 2, 4, 5 tetracyanobenzene, 1, 2 dicyanobenzene; 1, 4, dicyanobenzene and furmaric nitrile.
Claim 10
Dependent Claim
26 words
A device as described in claim 4 wherein said donor molecule is taken from the group consisting of triaryl - Δ 2 - pyrazoline and spiropyrans.
Claim 11
Dependent Claim
17 words
A device as described in claim 4 wherein said donor molecule is 1-phenyl-3-diethylaminostyrl-5-diethylaminophenyl - Δ 2 -pyrazoline.
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) | 1980-07-04 | 1981-01-03 | 1981-07-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-07-04 | 1985-01-03 | 1985-07-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-07-04 | 1989-01-03 | 1989-07-05 | $7700.00 | Window Closed / Lapsed |