US4090782A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrochromic display devices comprising thienylidene pyrazoline compounds
Assignee: International Business Machines Corp
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Filing: 1977-05-31
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Granted: 1978-05-23
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Expires: 1997-05-31
Abstract
Abstract This invention relates to a reversible display device based upon the electrochromic properties of certain thienylidene pyrazoline compounds when used in conjunction with a complementary redox material.
Inventors
- 👤 Karin Else Bredfeldt
- 👤 Robert Bruce Champ
- 👤 Karl John Fowler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:25
CPC Classifications
C; C09; C09K; C09K9/00; C09K9/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/15; G02F1/1503
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
80 words
A reversible electrochromic display device comprising a reactive medium between two electrically conductive electrodes, at least one of which is transparent, said medium comprising an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor and the oxidant is a thienylidene pyrazoline compound having the formula wherein R equals a phenyl or thienyl ring which may be substituted with an electron releasing group and each of R 1 and R 2 is hydrogen or lower alkyl.
Claim 2
Dependent Claim
80 words
A reversible electrochromic display device comprising a reactive medium between two electrically conductive electrodes, at least one of which is transparent, said medium comprising an anhydrous solvent and an oxidant/reductant pair in which the reductant is an electron acceptor and the oxidant is a thienylidene pyrazoline compound having the formula wherein R equals a phenyl or thienyl ring which may be substituted with an electron releasing group and each of R 1 and R 2 is hydrogen or lower alkyl.
Claim 3
Dependent Claim
14 words
A device as claimed in claim 1 wherein the oxidant is 1-p-anisyl-3-[2-(3-methyl-2-thienyl)-vinyl]-5-p-diethylamino phenyl Δ-2-pyrazoline.
Claim 4
Dependent Claim
14 words
A device as claimed in claim 1 wherein the oxidant is 1-p-anisyl-3-[2-(5-methyl-2-thienyl)-vinyl]-5-p-diethylamino phenyl Δ-2-pyrazoline.
Claim 5
Dependent Claim
13 words
A device as claimed in claim 1 wherein the oxidant is 1-p-anisyl-3-[2-(3-methyl-2-2-thienyl)-vinyl]-5-[3-methyl-2-thienyl] Δ-2-pyrazoline.
Claim 6
Dependent Claim
13 words
A device as claimed in claim 1 wherein the oxidant is 1-p-anisyl-3-[2-(3-methyl-2-thienyl)-vinyl]-5-phenyl Δ-2-pyrazoline.
Claim 7
Dependent Claim
13 words
A device as claimed in claim 1 wherein the oxidant is 1-p-anisyl-3-[2-(2-thienyl)-vinyl]-5-[2-thienyl] Δ-2-pyrazoline.
References Cited (Backward Citations)
US3180729A
Cited
US3451741A
Cited
US3806229A
Cited
US3854794A
Cited
US3824099A
Cited
US3837851A
Cited
US4018508A
Cited
US3957352A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-22 | 1981-11-21 | 1982-05-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-22 | 1985-11-21 | 1986-05-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-22 | 1989-11-21 | 1990-05-23 | $7700.00 | Window Closed / Lapsed |