US5006409A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical element used to reduce the image perception time
Assignee: Individual
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Filing: 1990-02-01
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Granted: 1991-04-09
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Expires: 2010-02-01
Abstract
Abstract An optical element for use in eyeglasses, visors, masks and screens to reduce the image perception time and improve the countour definition of the image comprises a transparent plastic material supporting member into which there is introduced, by suitable processing operations, 4-nitro-2-methyl-4-diethanolamino-azobenzene having the following formula ##STR1##
Inventors
- 👤 Paolo Baiocchi
- 👤 Giuseppe Iori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 18:15
CPC Classifications
C; C08; C08K; C08K5/00; C08K5/16; C08K5/32; G; G02; G02B; G02B1/00; G02B1/04; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31786; Y10T428/31855
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
41 words
An optical element for use in eyeglasses, visors, masks and screens to reduce an image perception time and improve a contour definition thereof, wherein said optical element comprises a transparent plastic supporting member including 4-nitro-2-methyl-4-diethanolamino-azobenzene from 50 ppm to 350 ppm.
Claim 2
Dependent Claim
41 words
An optical element for use in eyeglasses, visors, masks and screens to reduce an image perception time and improve a contour definition thereof, wherein said optical element comprises a transparent plastic supporting member including 4-nitro-2-methyl-4-diethanolamino-azobenzene from 50 ppm to 350 ppm.
Claim 3
Dependent Claim
46 words
An optical element according to claim 1, wherein said transparent plastic support members are selected from the group consisting of polymers of polyolallyl-carbonate, polyacrylates and polyalkylacrylates, a cellulose esters which is cellulose acetate, cellulose acetate-propionate, cellulose acetate-butyrate, cellulose triacetate, cellulose propionate, polyurethanes, aromatic polycarbonates and polystyrene.
Claim 4
Dependent Claim
47 words
An optical element according to claim 1, wherein said transparent plastic support members are selected from the group consisting of copolymers of polyolallyl-carbonate, polyacrylates and polyalkylacrylates, cellulose acetate, cellulose acetate-propionate, cellulose acetate butyrate, cellulose triacetate, cellulose propionate, polyurethanes, aromatic polycarbonates with methylmethacrylate, maleic anydride, triallylkyanurate and, vinylacetate.
Claim 5
Dependent Claim
22 words
An optical element according to claim 1, wherein said 4-nitro-2-methyl-4-diethanolamino-azobenzene is directly introduced into a polymeric material, which is then plate extruded.
Claim 6
Dependent Claim
35 words
An optical element according to claim 1, wherein said 4-nitro-2-methyl-4-diethanolamino-azobenzene is applied on a surface of said transparent plastic support member by a thermal transfer process, either in a liquid phase or a vapor phase.
Claim 7
Dependent Claim
20 words
An optical element according to claim 1, wherein said support member has a single surface thereof processed by said 4-nitro-2-methyl-4-diethanolamino-azobenzene.
References Cited (Backward Citations)
US3968119A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1994-04-08 | 1994-10-08 | 1995-04-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-08 | 1998-10-08 | 1999-04-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-08 | 2002-10-08 | 2003-04-09 | $7700.00 | Window Closed / Lapsed |