Patent US3674341A successfully refreshed from Google Patents.
US3674341A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid crystal display device having improved optical contrast
Assignee: SCM Corp
•
Filing: 1970-12-08
•
Granted: 1972-07-04
•
Expires: 1990-12-08
Abstract
Abstract AN ELECTRO-OPTICALL DISPLAY DEVICE IS DISCLOSED HAVING A LIGHT SOURCE AND A LIQUID CRYSTAL DISPLAY PANEL. THE DISPLAY PANEL COMPRISES AN ORGANIC NEMATIC MESOMORPHIC COMPOUND CONFINED BETWEEN TWO SUBSTANTIALLY PLANER PARALLEL SURFACES OF TWO JUXTAPOSED TRANSPARENT PLATES, AND MEANS FOR ESTABLISHING ELECTRIC FIELDS THROUGH SELECTED PORTIONS OF THE ORGANIC NEMATIC MESOMORPHIC COMPOUND. THE DISPLAY DEVICE ALSO INCLUDES MEANS FOR DIRECTING A BEAM OF LIGHT FROM THE LIGHT SOURCE OBLIQUELY ONTO AT LEAST ONE OF THE SUBSTANTIALLY PLANAR PARALLEL SURFACES OF THE TRANSPARENT PLATES AND ONTO THE ORGANIC NEMATIC MESOMORPHIC COMPOUND.
Inventors
- 👤 Clarence L Hedman Jr
- 👤 Karl-Dieter S Myrenne
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:07
CPC Classifications
C; C09; C09K; C09K19/00; C09K19/02; G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1335; G02F1/1336; G02F1/133602; G02F1/133604; G02F1/133605; G02F1/133615; G02F1/133621
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |