US3886014A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of production of a liquid crystal cell
Assignee: Electrovac AG
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Filing: 1973-04-16
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Granted: 1975-05-27
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Expires: 1993-04-16
Abstract
Abstract A method of production of a liquid crystal cell, which comprises the steps of covering a first plate with crystals of a crystal fraction. The limits deviate from each other in case of an upper crystal limit of no more than 25 um no more than 6 um and in case of an upper crystal limit of more than 25 um no more than 25% of the upper crystal limit. The crystals are arranged in one layer spaced apart at distances from each other. The distances surpass appreciably at an average the crystal size. A second plate is provided on the first plate covered with the crystals. The arrangement of the steps of providing first and second plates until a predetermined number of plates being obtained is repeated. The pile of the plates is heated with simultaneous application of pressure. The plates are hermetically connected at their edge zones with a provision of filling- and ventilating openings. The plates are then cooled off. The spaces defined between each pair of adjacent plates are filled with said crystal liquid, and the filling- and ventilating openings are hermetically filled.
Inventors
- 👤 Helmut Bayer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:14
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339; G02F1/13392; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1043; Y10T156/1044
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
219 words
A method of producing a liquid-crystal cell comprising the steps of: a. distributing substantially uniformly over a surface of a first plate grains of a particle size deviating by no more than 6 microns for grains of a particle-size range with an upper limit of 25 microns and deviating by no more than 25% of the upper particle-size limit for grains of a particle size range of more than 25 microns; b. spacing the grains distributed on said first plate in a single layer with an intergrain spacing appreciably exceeding on the average, the grain size; c. applying a second plate to said layer of grains on said first plate and covering said second plate with a second layer of grains; d. repeating steps (a) - (c) to form a stack of plates with respective single layers of grains between successive plates to define respective compartments until the stack attains a predetermined number of plates; e. heating and applying pressure to said stack of plates to Bond the plates of said stack to said grains together; f. hermetically sealing the pairs of plates defining each compartment together at their respective edge zones while leaving filling and venting openings therealong; g. cooling said plates; h. filling each of said compartments with a liquid-crystal material; and i. hermetically closing said openings.
Claim 2
Independent Claim
219 words
A method of producing a liquid-crystal cell comprising the steps of: a. distributing substantially uniformly over a surface of a first plate grains of a particle size deviating by no more than 6 microns for grains of a particle-size range with an upper limit of 25 microns and deviating by no more than 25% of the upper particle-size limit for grains of a particle size range of more than 25 microns; b. spacing the grains distributed on said first plate in a single layer with an intergrain spacing appreciably exceeding on the average, the grain size; c. applying a second plate to said layer of grains on said first plate and covering said second plate with a second layer of grains; d. repeating steps (a) - (c) to form a stack of plates with respective single layers of grains between successive plates to define respective compartments until the stack attains a predetermined number of plates; e. heating and applying pressure to said stack of plates to Bond the plates of said stack to said grains together; f. hermetically sealing the pairs of plates defining each compartment together at their respective edge zones while leaving filling and venting openings therealong; g. cooling said plates; h. filling each of said compartments with a liquid-crystal material; and i. hermetically closing said openings.
Claim 3
Dependent Claim
56 words
The method defined in claim 1 wherein said grains have a 15-hour-stress-relieving temperature which is less than that of said plates, said stack being heated to a temperature exceeding the 15-hour-stress-relieving temperature of said grains but below the 15-hour-stress-relieving temperature of said plates, said plates being pressed together to define the interplate width of each compartment.
Claim 4
Dependent Claim
22 words
The method defined in claim 1 wherein the plates are hermetically connected along their edges at least in part by glass solder.
Claim 5
Dependent Claim
17 words
The method defined in claim 3 wherein said glass solder is applied by screening onto said plates.
Claim 6
Dependent Claim
40 words
The method defined in claim 1 wherein said plates have a 15-hour-stress-relieving temperature below that of said grains, said method comprising heating said stack of a temperature above the 15-hour-stress-relieving temperature of said plates but below that of said grains.
Claim 7
Dependent Claim
15 words
The method defined in claim 1 further comprising bending said stack during the heating thereof.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-05-26 | 1978-11-25 | 1979-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-26 | 1982-11-25 | 1983-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-26 | 1986-11-25 | 1987-05-27 | $7700.00 | Window Closed / Lapsed |