US3854794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Image display cell
Assignee: US Philips Corp
•
Filing: 1972-12-11
•
Granted: 1974-12-17
•
Expires: 1992-12-11
Abstract
Abstract An image display cell having a transparent wall portion, electrodes and an oxidizable redox substance and a reducible redox substance in an electrochemically inert liquid in contact with electrodes. The cell includes at least two electrodes which are in contact with a cell liquid in which a colourless viologen salt (formula I) has been dissolved. When a potential difference of at least 0.5 Volt is applied to the electrodes, this salt is reduced to a coloured insoluble compound which adheres to the cathode, so that the latter is coloured, thereby producing an image.
Inventors
- 👤 Dam H Van
- 👤 J Ponjee
- 👤 C Schoot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:51
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1503
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
74 words
AN IMAGE DISPLAY CELL COMPRISING A CASING HAVING A TRANSPARENT WALL PART A RDUCIBLE REDOX SUBSTANCE AND AN OXIDIZABLE REDOX SUBSTANCE IN WATER WITHIN SAID CASING AND AT LEAST TWO INERT ELECTRODES IN CONTACT WITH SAID WATER, BOTH THE REDUCIBLE REDOX SUBSTANCE AND THE OXIDIZABLE REDOX SUBSTANCE BEING PRESENT IN THE CELL, SAID REDUCIBLE REDOX SUBSTANCE HAVING A SOLUBILITY IN WATER IN EXCSS OF 10**-2 MOLE/LITER AND BEING A COMPOUND OF THE FORMULA 1
Claim 2
Dependent Claim
74 words
AN IMAGE DISPLAY CELL COMPRISING A CASING HAVING A TRANSPARENT WALL PART A RDUCIBLE REDOX SUBSTANCE AND AN OXIDIZABLE REDOX SUBSTANCE IN WATER WITHIN SAID CASING AND AT LEAST TWO INERT ELECTRODES IN CONTACT WITH SAID WATER, BOTH THE REDUCIBLE REDOX SUBSTANCE AND THE OXIDIZABLE REDOX SUBSTANCE BEING PRESENT IN THE CELL, SAID REDUCIBLE REDOX SUBSTANCE HAVING A SOLUBILITY IN WATER IN EXCSS OF 10**-2 MOLE/LITER AND BEING A COMPOUND OF THE FORMULA 1
Claim 3
Dependent Claim
39 words
An image display cell as claimed in claim 1 wherein the formulae I and II X is a moiety selected from the group consisting of ClO4 , BF4 , NO3 , Cl , Br , F and C6H5SO3 ,
Claim 4
Dependent Claim
20 words
An image display cell as claimed in claim 1, wherein each anode is arranged at an angle to each cathode.
Claim 5
Dependent Claim
17 words
An image display cell as claimed in claim 3 wherein each anode is coplanar with each cathode.
Claim 6
Dependent Claim
20 words
An image display cell as claimed in claim 1 wherein a white insoluble substance is dispersed in the cell liquid.
Claim 7
Dependent Claim
24 words
An image display cell as claimed in claim 1, wherein a porous screen is interposed in the cell between the anode and each cathode.
Claim 8
Dependent Claim
24 words
An image display cell as claimed in claim 1 wherein the cell contains at least one reference electrode positioned relatively close to the cathode.
Claim 9
Dependent Claim
20 words
An image display cell as claimed in claim 1 wherein the cell liquid contains a salt which increases its conductivity.
References Cited (Backward Citations)
US3451741A
Cited
US3652149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-12-16 | 1978-06-17 | 1978-12-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-16 | 1982-06-17 | 1982-12-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-16 | 1986-06-17 | 1986-12-17 | $7700.00 | Window Closed / Lapsed |