US3927064A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Benzylidene-aminobenzonitriles
Assignee: F Hoffmann La Roche AG
•
Filing: 1973-02-21
•
Granted: 1975-12-16
•
Expires: 1993-02-21
Abstract
Abstract Liquid crystal substances or compounds of the formula WHEREIN R is as hereinafter set forth, as well as compositions and electro-optical apparatuses containing them are described.
Inventors
- 👤 Arthur Boller
- 👤 Hanspeter Scherrer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:04
CPC Classifications
C; C07; C07C; C07C255/00
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 2
Dependent Claim
5 words
A COMPOUND OF THE FORMULA
Claim 3
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-ethylbenzyliden)amino)benzonitrile.
Claim 4
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-n-propylbenzyliden)amino)benzonitrile.
Claim 5
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-n-butylbenzyliden)amino)benzonitrile.
Claim 6
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-n-pentylbenzyliden)amino)benzonitrile.
Claim 7
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-n-hexylbenzyliden)amino)benzonitrile.
Claim 8
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-isohexylbenzyliden)amino)benzonitrile.
Claim 9
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-n-heptylbenzyliden)amino)benzonitrile.
Claim 10
Dependent Claim
8 words
A compound in accordance with claim 1, p-((p-n-octylbenzyliden)amino)benzonitrile.
References Cited (Backward Citations)
US3499702A
Cited
US3731986A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-12-15 | 1979-06-16 | 1979-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-15 | 1983-06-16 | 1983-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-15 | 1987-06-16 | 1987-12-16 | $7700.00 | Window Closed / Lapsed |