US3816795A
Expired / Lapsed
US
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Method for providing electroluminescent light from a polycyclic heterocyclic compound in an aprotic solvent under electric current
Assignee: Wyeth Holdings LLC
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Filing: 1971-12-13
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Granted: 1974-06-11
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Expires: 1991-12-13
Abstract
Abstract Method for providing electroluminescent emission in an electrolytic cell by subjecting to an alternating current an electrolytic cell containing at least two electrodes in a mixture of (a) a substantially inert solvent, (b) a fluorescent organic polycyclic heterocyclic compound, and a supporting electrolyte.
Inventors
- 👤 D Maricle
- 👤 Rauhut M Mckay
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 20:43
CPC Classifications
F; F21; F21K; F21K2/00; F21K2/06; F21K2/08
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
11 words
The process of claim wherein the fluorescent compound is N-methyl phenothiazine.
Claim 2
Dependent Claim
11 words
The process of claim 1 wherein the electrolyte is tetrabutylammonium perchlorate.
Claim 3
Dependent Claim
11 words
The process of claim 1 wherein the electrolyte is lithium bromide.
Claim 4
Dependent Claim
10 words
The process of claim 1 wherein the solvent is dimethylformamide.
Claim 5
Dependent Claim
18 words
The process of claim 1 wherein the solvent is dioxane containing up to about 10 per cent water.
Claim 6
Dependent Claim
10 words
The process of claim 1 wherein the solvent is 1,2-dimethoxyethane.
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) | 1977-06-10 | 1977-12-10 | 1978-06-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-10 | 1981-12-10 | 1982-06-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-10 | 1985-12-10 | 1986-06-11 | $7700.00 | Window Closed / Lapsed |