US5460907A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photorefractive materials
Assignee: International Business Machines Corp
•
Filing: 1994-09-22
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Granted: 1995-10-24
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Expires: 2014-09-22
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
2026-10-24 06:39
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: 2
Claim 1
Independent Claim
50 words
A photorefractive device comprising: (i) a transparent element of an amorphous 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; and (ii) electrodes.
Claim 2
Dependent Claim
50 words
A photorefractive device comprising: (i) a transparent element of an amorphous 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; and (ii) electrodes.
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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) | 1998-10-23 | 1999-04-24 | 1999-10-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-10-23 | 2003-04-24 | 2003-10-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-10-23 | 2007-04-24 | 2007-10-24 | $7700.00 | Window Closed / Lapsed |