US3853392A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gasket for liquid crystal light shutters
Assignee: F Hoffmann La Roche AG
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Filing: 1973-09-13
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Granted: 1974-12-10
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Expires: 1993-09-13
Abstract
Abstract A gasket for a field effect light shutter comprising an insulating material, preferably a thermoplastic resin, incorporating a material which conducts electricity whereby the capacitive storage time of the field effect liquid crystal light shutter is decreased with an attendant improvement in the response time of the shutter. The material which conducts electricity is preferably powdered carbon, a semiconducting material, or some other material, not an insulator, with a resistivity less than 106 ohm-centimeters.
Inventors
- 👤 J Fergason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:02
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/133; G02F1/1333; G02F1/1339
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
115 words
IN A FEILD EFFECT LIQUID CRYSTAL LIGHT SHUTTER, THE COMBINATION OF A LAYER OF LIQUID CRYSTAL MATERIAL SANDWICHED BETWEEN TRANSPARENT PARALLEL PLATES, FILMS OF TRANSPARENT CONDUCTIVE MATERIAL ON THE PLATES AND IN CONTACT WITH THE LIQUID CRYSTAL MATERIAL, MEANS FOR APPLYING A POTENTIAL BETWEEN SAID FILMS OF TRANSPARENT MATERIAL TO THEREBY EFFECT A LIGHT SHUTTER ACTION, A GASKET SURROUNDING SAID LAYER OF LIQUID CRYSTAL MATERIAL TO CONFINE IT BETWEEN SAID PLATES, SAID GASKET BEING IN CONTACT WITH SAID FILMS OF CONDUCTIVE MATERIAL AND BEING FORMED FROM AN INSULATOR CONTAINING A MATERIAL WHICH WILL REDUCE THE EFFECTIVE RESISTANCE OF THE LIQUID CRYSTAL LAYER BETWEEN THE FILMS TO DECREASE THE CAPATIVE STORAGE TIME OF SAID LIGHT SHUTTER.
Claim 2
Dependent Claim
115 words
IN A FEILD EFFECT LIQUID CRYSTAL LIGHT SHUTTER, THE COMBINATION OF A LAYER OF LIQUID CRYSTAL MATERIAL SANDWICHED BETWEEN TRANSPARENT PARALLEL PLATES, FILMS OF TRANSPARENT CONDUCTIVE MATERIAL ON THE PLATES AND IN CONTACT WITH THE LIQUID CRYSTAL MATERIAL, MEANS FOR APPLYING A POTENTIAL BETWEEN SAID FILMS OF TRANSPARENT MATERIAL TO THEREBY EFFECT A LIGHT SHUTTER ACTION, A GASKET SURROUNDING SAID LAYER OF LIQUID CRYSTAL MATERIAL TO CONFINE IT BETWEEN SAID PLATES, SAID GASKET BEING IN CONTACT WITH SAID FILMS OF CONDUCTIVE MATERIAL AND BEING FORMED FROM AN INSULATOR CONTAINING A MATERIAL WHICH WILL REDUCE THE EFFECTIVE RESISTANCE OF THE LIQUID CRYSTAL LAYER BETWEEN THE FILMS TO DECREASE THE CAPATIVE STORAGE TIME OF SAID LIGHT SHUTTER.
Claim 3
Dependent Claim
20 words
The light shutter of claim 1 wherein said insulating material from which the gasket is formed comprises a thermoplastic resin.
Claim 4
Dependent Claim
21 words
The light shutter of claim 1 wherein said material which reduces the effective resistance comprises a semiconductive material in powdered form.
Claim 5
Dependent Claim
24 words
The light shutter of claim 3 wherein said powdered material is selected from the group consisting of doped zinc oxide and doped lead oxide.
Claim 6
Dependent Claim
33 words
The light shutter of claim 3 wherein said semiconductive material has a resistivity of about 106 ohm-centimeters and comprises up to about 50 percent by weight of the total weight of said gasket.
Claim 7
Dependent Claim
27 words
The light shutter of claim 1 wherein said material which will reduce the effective resistance has a resistivity in the range of about 103 to 106 ohm-centimeters.
Claim 8
Dependent Claim
17 words
The light shutter of claim 1 wherein said material which reduces the effective resistance comprises carbon black.
Claim 9
Dependent Claim
24 words
The light shutter of claim 7 wherein said carbon black comprises up to 1 percent by weight of the total weight of said gasket.
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) | 1977-12-09 | 1978-06-10 | 1978-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-12-09 | 1982-06-10 | 1982-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-12-09 | 1986-06-10 | 1986-12-10 | $7700.00 | Window Closed / Lapsed |