US5719981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Opto-electric device
Assignee: Ricoh Co Ltd
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Filing: 1994-08-25
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Granted: 1998-02-17
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Expires: 2014-08-25
Abstract
Abstract An optical integrated circuit for preventing unnecessary optical waves from outside or scattered in a waveguide. The optical integrated circuit has an substrate, a wave guide which has a core layer and at least a clad layer formed on the substrate, in which an optical wave is guided and transmitted, and a cover layer of which material has a high optical wave absorption ratio, which is formed on the waveguide partially or entirely.
Inventors
- 👤 Ikuo Katoh
- 👤 Kiyoshi Yokomori
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:56
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/12; G02B6/122; G02B6/12004; G02B6/24; G02B6/42; G02B2006/12035; G02B2006/12069; G02B2006/12071
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
83 words
An opto-electric device comprising: a substrate; a waveguide capable of guiding and transmitting an optical wave which comprises a core layer and at least one clad layer formed on said substrate; and a cover layer having a high optical wave absorption ratio, and which is formed on said waveguide either partially or entirely, wherein said cover layer comprises a high molecular weight compound and a dye, wherein said high molecular weight compound is a polymethyl methacrylate and said dye is an azo dye.
Claim 2
Dependent Claim
83 words
An opto-electric device comprising: a substrate; a waveguide capable of guiding and transmitting an optical wave which comprises a core layer and at least one clad layer formed on said substrate; and a cover layer having a high optical wave absorption ratio, and which is formed on said waveguide either partially or entirely, wherein said cover layer comprises a high molecular weight compound and a dye, wherein said high molecular weight compound is a polymethyl methacrylate and said dye is an azo dye.
Claim 3
Dependent Claim
24 words
The device of claim 1, wherein the refractive index of the cover layer is almost or exactly same as that of the clad layer.
Claim 4
Dependent Claim
22 words
The device of claim 1, wherein the high molecular weight compound contains minute particles having a of high optical wave absorption ratio.
Claim 5
Dependent Claim
12 words
The device of claim 3, wherein the minute particles are carbon black.
Claim 6
Dependent Claim
13 words
The device of claim 1, wherein the high molecular compound has a micro-structure.
Claim 7
Dependent Claim
11 words
The device of claim 5, wherein the micro-structure comprises hollow voids.
Claim 8
Dependent Claim
22 words
The device of claim 1, further comprising a glue layer formed between the cover layer and said at least one clad layer.
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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) | 2001-02-16 | 2001-08-18 | 2002-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-02-16 | 2005-08-18 | 2006-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-02-16 | 2009-08-18 | 2010-02-17 | $7700.00 | Window Closed / Lapsed |