US3896016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fabrication of liquid crystal devices
Assignee: RCA Corp
•
Filing: 1974-07-05
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Granted: 1975-07-22
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Expires: 1994-07-05
Abstract
Abstract Glass workpieces having a conductive material film on one surface, for eventual use as substrates between which a liquid crystal material is contained, are treated to remove or deplete various impurities from a thin region within the substrates at the one surface.
Inventors
- 👤 Lawrence Alan Goodman
- 👤 David Emil Carlson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:26
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
133 words
IN THE FABRCATION OF A LIQUID CRYSTAL DEVICE COMPRISING A PAIR OF OPPOSITELY DISPOSED SUBSTRATES OF AN ALKALI-CONTAINING GLASS, FIRST SURFACES OF EACH OF SAID SUBSTRATES BEING DISPOSED IN OPPOSITELY DISPOSED, FACING RELATIONSHIP. THE METHOD COMPRISING: COATING EACH OF SAID FIRST SURFACES OF SAID SUBSTRATES WITH A LAYER OF AN ELECTRICAL CONDUCTIVE MATERIAL, DEPLETING ALKALI IONS FROM A RIGION OF EACH SUBSTRATE IMMEDIATELY BENEATH SAID CONDUCTIVE MATERIAL LAYER THEREON USING A PROCESS IN WHICH THE POSITIVE TERMINAL OF A DC POWER SUPPLY IS ELECTRICALLY CONNECTED TO SAID FIRST SURFACE OF EACH SUBSTRATE THROUGH SAID CONDUCTIVE LAYER THEREON, A SECOND SURFACE OF EACH OF SAID SUBSTRATES SPACED FROM SAID FIRST SURFACE THEREOF BEING ELECTRICALLY CONNECTED TO THE NEGATIVE TERMINAL OF SAID POWER SUPPLY, AND ASSEMBLING SAID SUBSTRATES WITH SAID FIRST SURFACES IN FACING RELATIONSHIP.
Claim 2
Dependent Claim
133 words
IN THE FABRCATION OF A LIQUID CRYSTAL DEVICE COMPRISING A PAIR OF OPPOSITELY DISPOSED SUBSTRATES OF AN ALKALI-CONTAINING GLASS, FIRST SURFACES OF EACH OF SAID SUBSTRATES BEING DISPOSED IN OPPOSITELY DISPOSED, FACING RELATIONSHIP. THE METHOD COMPRISING: COATING EACH OF SAID FIRST SURFACES OF SAID SUBSTRATES WITH A LAYER OF AN ELECTRICAL CONDUCTIVE MATERIAL, DEPLETING ALKALI IONS FROM A RIGION OF EACH SUBSTRATE IMMEDIATELY BENEATH SAID CONDUCTIVE MATERIAL LAYER THEREON USING A PROCESS IN WHICH THE POSITIVE TERMINAL OF A DC POWER SUPPLY IS ELECTRICALLY CONNECTED TO SAID FIRST SURFACE OF EACH SUBSTRATE THROUGH SAID CONDUCTIVE LAYER THEREON, A SECOND SURFACE OF EACH OF SAID SUBSTRATES SPACED FROM SAID FIRST SURFACE THEREOF BEING ELECTRICALLY CONNECTED TO THE NEGATIVE TERMINAL OF SAID POWER SUPPLY, AND ASSEMBLING SAID SUBSTRATES WITH SAID FIRST SURFACES IN FACING RELATIONSHIP.
Claim 3
Dependent Claim
58 words
The method of claim 1 in which said ion depletion step includes heating said substrates at a preselected elevated temperature while applying a DC voltage of said stated polarity between said first and second surfaces of each of said substrates, and wherein said DC voltage is applied while said substrates are being heated up to said preselected temperature.
Claim 4
Dependent Claim
49 words
The method of claim 2 wherein said assembling step includes the further step of exposing said substrates to a second preselected temperature for a preselected time, said regions having been made of a depth sufficient to prevent diffusion of alkali ions therethrough during the performance of said further step.
Claim 5
Dependent Claim
30 words
The method of claim 3 in which said further step is performed at about 350*C for about 1/2 hour, and said regions are made of a depth of about 500A.
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) | 1978-07-21 | 1979-01-20 | 1979-07-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-07-21 | 1983-01-20 | 1983-07-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-07-21 | 1987-01-20 | 1987-07-22 | $7700.00 | Window Closed / Lapsed |