US5064264A
Expired / Lapsed
US
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Photorefractive materials
Assignee: International Business Machines Corp
•
Filing: 1990-10-26
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Granted: 1991-11-12
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Expires: 2010-10-26
Abstract
Abstract The present invention relates to polymeric materials that exhibit an erasable photorefractive effect which can be fabricated into optical devices such as optical wave guides.
Inventors
- 👤 Stephen P. Ducharme
- 👤 William E. Moerner
- 👤 John C. Scott
- 👤 Robert J. Twieg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:00
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0018; G02F1/35; G02F1/355; G02F1/361; G02F1/3615; G02F1/3616; G03; G03H; G03H1/00; G03H1/02; G03H2001/026; G03H2001/0264; G03H2260/00; G03H2260/30; G03H2260/35; G03H2260/50; G03H2260/54
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
39 words
An amorphous photorefractive material comprising a polymer, a non-linear optical chromophore and a charge transport agent, said material having a diffraction efficiency greater than 10 -8 and a photoconductivity greater than 10 -14 inverse-ohm-centimeter per watt per square centimeter.
Claim 2
Dependent Claim
39 words
An amorphous photorefractive material comprising a polymer, a non-linear optical chromophore and a charge transport agent, said material having a diffraction efficiency greater than 10 -8 and a photoconductivity greater than 10 -14 inverse-ohm-centimeter per watt per square centimeter.
Claim 3
Dependent Claim
20 words
The material of claim 1 wherein said material comprises at least about 20% by weight of said charge transport agent.
Claim 4
Dependent Claim
24 words
The material of claim 2 wherein said polymer is polyester, polyamide, polyurethane or a polymer comprising one or more epoxy, cyanato and maleimido monomers.
Claim 5
Dependent Claim
10 words
The material of claim 3 wherein said polymer is crosslinked.
Claim 6
Dependent Claim
18 words
The material of claim 3 wherein said charge transport agent is an aryl amine, carbazole or a hydrazone.
Claim 7
Dependent Claim
16 words
The material of claim 3 wherein said non-linear optical chromophore is covalently bonded to said polymer.
Claim 8
Dependent Claim
14 words
The material of claim 2 wherein said material further comprises a charge generating agent.
Claim 9
Dependent Claim
14 words
The material of claim 2 wherein said material further comprises a charge trapping agent.
Claim 10
Dependent Claim
49 words
An optical article for the transmission of electromagnetic radiation comprising an amorphous photorefractive material comprising a polymer, a non-linear optical chromophore and a charge transport agent, said material having a defraction efficiency greater than 10 -8 and a photoconductivity greater than 10 -14 inverse-ohm-centimeter per watt per square centimeter.
Claim 11
Dependent Claim
49 words
An optical article for the transmission of electromagnetic radiation comprising an amorphous photorefractive material comprising a polymer, a non-linear optical chromophore and a charge transport agent, said material having a defraction efficiency greater than 10 -8 and a photoconductivity greater than 10 -14 inverse-ohm-centimeter per watt per square centimeter.
Claim 12
Dependent Claim
20 words
The article of claim 9 wherein the material comprises at about least 20% by weight of said charge transport agent.
Claim 13
Dependent Claim
24 words
The article of claim 10 wherein said polymer is polyester, polyamide, polyurethane or a polymer comprising one or more epoxy, cyanato and maleimido monomers.
Claim 14
Dependent Claim
10 words
The article of claim 11 wherein said polymer is crosslinked.
Claim 15
Dependent Claim
19 words
The article of claim 11 wherein said charge transport agent is an aryl amine, a carbazole or, a hydrazone.
Claim 16
Dependent Claim
16 words
The article of claim 11 wherein said non-linear optical chromophore is covalently bonded to said polymer.
Claim 17
Dependent Claim
14 words
The article of claim 10 wherein said material further comprises a charge generating agent.
Claim 18
Dependent Claim
14 words
The article of claim 10 wherein said material further comprises a charge trapping agent.
Claim 19
Dependent Claim
13 words
The article of claim 10 wherein said article is an optical wave guide.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1994-11-11 | 1995-05-13 | 1995-11-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-11-11 | 1999-05-13 | 1999-11-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-11-11 | 2003-05-13 | 2003-11-12 | $7700.00 | Window Closed / Lapsed |