US3758195A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage-controlled spectral separation of light with liquid crystals
Assignee: SCM Corp
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Filing: 1972-04-10
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Granted: 1973-09-11
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Expires: 1992-04-10
Abstract
Abstract Light of different colors is produced by using as a ''''diffraction grating'''' a cell containing a liquid crystal material, with selectively variable fields being applied across the cell to present the different colors at a viewing station. Application is made to monochromators, symbol displays, and other devices.
Inventors
- 👤 C Hedman
- 👤 K Myrenne
- 👤 P Vartanian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:56
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/29; G02F1/292; G02F1/01; G02F1/23; G02F1/13; G02F1/137; G02F2203/00; G02F2203/22; G02F2203/34
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
43 words
The combination defined in claim 1, wherein said coatings comprise a plurality of ordinal displays with a said symbol coating in each order consisting of a plurality of segments, each segment having a lead selectably connectible in circuit with said source of potential.
Claim 2
Dependent Claim
82 words
The combination of claim 2, wherein there are two sources having first and second potentials, and further including a two-position control operable to provide said first potential to said symbol coatings when said control is in one of said two positions and to provide said second potential to said symbol coatings when said control is in the other of said two positions, said first and second potentials causing said symbol forms to be presented at said viewing station in corresponding different colors.
Claim 3
Dependent Claim
29 words
The combination of claim 3, wherein said first potential causes display in a first anomalous dispersion band and said second potential causes display in a second anomalous dispersion band.
Claim 4
Dependent Claim
26 words
The combination of claim 3, wherein said sources of potential comprise alternating current sources, the frequency of said current being between 10 Hz and 1000 Hz.
Claim 5
Dependent Claim
25 words
The combination of claim 3, wherein said coatings are on opposed ones of said cell walls, said walls being spaced apart less than 25 microns.
Claim 6
Dependent Claim
13 words
The combination of claim 6, wherein said mesomorphic material has a nematic mesophase.
Claim 7
Dependent Claim
19 words
The combination of claim 7, wherein said nematic mesomorphic material comprises an isomer of p Butyl-p'' methoxy azoxy benzene.
Claim 8
Dependent Claim
21 words
The combination of claim 7, wherein said nematic mesomorphic material comprises a mixture of N-(p Methoxybenzylidine)-p n-butylaniline and N-(p Ethoxybenzylidine)-p n-butylaniline.
References Cited (Backward Citations)
US3499112A
Cited
US3675988A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-10 | 1977-03-12 | 1977-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-10 | 1981-03-12 | 1981-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-10 | 1985-03-12 | 1985-09-11 | $7700.00 | Window Closed / Lapsed |