US4402573A
Expired / Lapsed
US
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Materials for electrochromic display devices
Assignee: International Business Machines Corp
•
Filing: 1981-06-18
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Granted: 1983-09-06
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Expires: 2001-06-18
Abstract
Abstract A display device containing an electrochromic solution comprising a para substituted triphenylamine compound having the formula <IMAGE> wherein R is lower alkoxy, lower alkyl or halogen.
Inventors
- 👤 Carol R. Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:59
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1503
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
54 words
In an electrochromic display device comprising a transparent front electrode, a back electrode in spaced relation to said front electrode, and an electrochromic solution contained between said electrodes, the improvement according to which the electrochromic solution comprises a para-substituted triphenylamine compound having the formula ##STR4## wherein R is lower alkoxy, lower alkyl or halogen.
Claim 2
Dependent Claim
54 words
In an electrochromic display device comprising a transparent front electrode, a back electrode in spaced relation to said front electrode, and an electrochromic solution contained between said electrodes, the improvement according to which the electrochromic solution comprises a para-substituted triphenylamine compound having the formula ##STR4## wherein R is lower alkoxy, lower alkyl or halogen.
Claim 3
Dependent Claim
12 words
A device as claimed in claim 1 wherein R is lower alkoxy.
Claim 4
Dependent Claim
11 words
A device as claimed in claim 1 wherein R is methoxy.
Claim 5
Dependent Claim
19 words
A device as claimed in claim 1 wherein the electrochromic solution comprises 50% - 50% acetone as the solvent.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-09-05 | 1987-03-07 | 1987-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-09-05 | 1991-03-07 | 1991-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-09-05 | 1995-03-07 | 1995-09-06 | $7700.00 | Window Closed / Lapsed |