Patent US625950A successfully refreshed from Google Patents.
Patent US4756587A successfully refreshed from Google Patents.
US4756587A
Expired / Lapsed
US
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Optical multi/demultiplexer
Assignee: Hitachi Ltd
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Filing: 1987-08-12
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Granted: 1988-07-12
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Expires: 2007-08-12
Abstract
Abstract An optical multi/demultiplexer comprising a first waveguide for inputting/outputting light, second and third waveguides which are respectively arranged on both sides of the first waveguide, and first and second open-waveguides which are respectively arranged on sides of the second and third waveguides remote from the first waveguide.
Inventors
- 👤 Hirohisa Sano
- 👤 Katsuyuki Imoto
- 👤 Minoru Maeda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 21:51
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/24; G02B6/26; G02B6/28; G02B6/293; G02B6/29379; G02B6/2938; G02B6/10; G02B6/12; G02B6/12002; G02B6/12007; G02B6/29331; G02B6/29335; G02B6/29337; G02B6/42
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
44 words
An optical multi/demultiplexer, comprising: a first waveguide; second and third waveguides which are respectively arranged on both sides of said first waveguide; and first and second open-waveguides which are respectively arranged on sides of said second and third waveguides remote from said first waveguide.
Claim 2
Dependent Claim
44 words
An optical multi/demultiplexer, comprising: a first waveguide; second and third waveguides which are respectively arranged on both sides of said first waveguide; and first and second open-waveguides which are respectively arranged on sides of said second and third waveguides remote from said first waveguide.
Claim 3
Dependent Claim
44 words
An optical multi/demultiplexer, comprising: a first waveguide; second and third waveguides which are respectively arranged on both sides of said first waveguide; and first and second open-waveguides which are respectively arranged near said second and third waveguides on their sides of said first waveguide.
Claim 4
Dependent Claim
44 words
An optical multi/demultiplexer, comprising: a first waveguide; second and third waveguides which are respectively arranged on both sides of said first waveguide; and first and second open-waveguides which are respectively arranged near said second and third waveguides on their sides of said first waveguide.
Claim 5
Dependent Claim
35 words
An optical multi/demultiplexer, comprising: a waveguide for inputting light; at least one waveguide for outputting light, which is arranged near the light inputting waveguide; and an open-waveguide which is arranged near the light outputting waveguide.
Claim 6
Dependent Claim
35 words
An optical multi/demultiplexer, comprising: a waveguide for inputting light; at least one waveguide for outputting light, which is arranged near the light inputting waveguide; and an open-waveguide which is arranged near the light outputting waveguide.
Claim 7
Dependent Claim
35 words
An optical multi/demultiplexer as defined in claim 3, wherein an optical fiber is connected to one end of said light inputting waveguide, and a photosensor is connected to one end of said light outputting waveguide.
Claim 8
Dependent Claim
44 words
An optical multi/demultiplexer as defined in claim 3, further comprising another waveguide for outputting light, which is arranged near said light inputting waveguide on a side opposite the first-mentioned light outputting waveguide, and another open-waveguide which is arranged near the other light outputting waveguide.
Claim 9
Dependent Claim
45 words
An optical multi/demultiplexer as defined in claim 3, further comprising another waveguide for outputting light, which is arranged near said light inputting waveguide on the same side as the first-mentioned light outputting waveguide, and another open-waveguide which is arranged near the other light outputting waveguide.
References Cited (Backward Citations)
US4483583A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-07-12 | 1992-01-11 | 1992-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-07-12 | 1996-01-11 | 1996-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-07-12 | 2000-01-11 | 2000-07-12 | $7700.00 | Window Closed / Lapsed |