Patent US4717757A successfully refreshed from Google Patents.
US4717757A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mesomorphic side-chain polymers having high dielectric anisotropy and a method for producing said polymers
Assignee: Thales SA
•
Filing: 1987-03-23
•
Granted: 1988-01-05
•
Expires: 2007-03-23
Abstract
Abstract The invention relates to a family of sidechain homopolymers of the polyacrylate type derived from 3-fluoro-4-cyanophenol and exhibiting a mesophase of the nematic or smectic-A type. The polymer in accordance with the invention corresponds to the following general chemical formula : ##STR1## where x indicates the degree of polymerization and 4≦n≦15.
Inventors
- 👤 Jean C. Dubois
- 👤 Gilles Ravaux
- 👤 Pierre Le Barny
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 15:13
CPC Classifications
C; C07; C07C; C07C255/00; C08; C08F; C08F20/00; C08F20/02; C08F20/10; C08F20/34; C08F20/36; C09; C09K; C09K19/00; C09K19/04; C09K19/38; C09K19/3833; C09K19/3842; C09K19/3852; G; G02; G02F; G02F1/00; G02F1/35; G02F1/355; G02F1/361; G02F1/3615; G02F1/3617
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
26 words
A mesomorphic side-chain polymer which exhibits high dielectric anisotropy and corresponds to the following chemical formula: ##STR13## where x indicates the degree of polymerization and 4≦n≦15.
Claim 2
Dependent Claim
26 words
A mesomorphic side-chain polymer which exhibits high dielectric anisotropy and corresponds to the following chemical formula: ##STR13## where x indicates the degree of polymerization and 4≦n≦15.
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) | 1991-01-04 | 1991-07-06 | 1992-01-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-01-04 | 1995-07-06 | 1996-01-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-01-04 | 1999-07-06 | 2000-01-05 | $7700.00 | Window Closed / Lapsed |