US3675987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal compositions and devices
Assignee: WALTER E HELLER WESTERN Inc
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Filing: 1971-03-29
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Granted: 1972-07-11
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Expires: 1991-03-29
Abstract
Abstract ROOM TEMPERATURE NEMATIC LIQUID CRYSTAL COMPOSITIONS SUITABLE FOR USE AS SCATTERS OF LIGHT IN OPTICAL DEVICES ARE PRESENTED THAT INCLUDE AS A BASIC NEW COMPONENT P-METHOXYFORMYLOXYBENXYLIDENE P-N-BUTYLANILINE. SUCH COMPOSITIONS MAY ALSO INCLUDE P-ETHOXYBEN XYLIDENE P-N-BUTYLANILINE OR P-BUTOXYBENZYLIDENE P-N-BUTYLANILINE, ALONG WITH CERTAIN ADDITIVES INCLUDING P-TOLUYLIDENE P-N-BUTYANILINE. THE COMPOSITIONS ARE EMPLOYED IN THE FORM OF THIN LAYERS WITHIN THIN CELLS HAVING TRANSPARENT ELECTRODES WITH MEANS FOR APPLYING ELECTRIC FIELDS ACROSS THE LAYER. THE DISPLAY IS FORMED BY ELECTRICALLY CONTROLLING LIGHTSCATTERING PROPERTIES OF THE LIQUID CRYSTAL LAYER.
Inventors
- 👤 Mary J Rafuse
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 01:29
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/22; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13743
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |