Patent US3686235A successfully refreshed from Google Patents.
US3686235A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Class of liquid crystals
Assignee: FURN F KNAPP JR
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Filing: 1969-10-14
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Granted: 1972-08-22
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Expires: 1989-10-14
Abstract
Abstract THE CHEMICAL SYNTHESIS AND ISOLATION FROM NATURAL SOURCES OF A NEW CLASS OF CHOLESTERIC AND SMECTIC LIQUID CRYSTALS ARE DESCRIBED. THESE CONSIST OF VARIOUS FATTY ACID ESTERS OF TETRACYLIC TRIERTENES INCLUDING MEMBERS OF THE CLASS OF 9,19-CYCLOPROPANE TRITERPENES. THESE TRITERPENES INCLUDE 9,19-CYCLOLANOST-24-EN-3B-OL(CYCLOARTENOL), 4A,14A,24B-TRIMETHYL-9,19-CYCLOCHOLESTAN-3B-OL, 24E-METHYL-9,19-CYCLOLANOSTAN-3B-OL(24E-METHYL CYCLOARTANOL) AND 24-DIHYDRO LANOSTEROL AND ALL CHEMICALLY RELATED PRODUCTS.
Inventors
- 👤 Harold J Nicholas
- 👤 Furn F Knapp Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 21:59
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/32
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) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |