US4453803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical waveguide for middle infrared band
Assignee: National Institute of Advanced Industrial Science and Technology
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Filing: 1982-04-26
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Granted: 1984-06-12
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Expires: 2002-04-26
Abstract
Abstract An optical waveguide for transmission of light in the middle infrared band is produced by having its clad part formed of glass consisting preponderantly of germanium dioxide and its core part left unfilled.
Inventors
- 👤 Takehiko Hidaka
- 👤 Takitaro Morikawa
- 👤 Junichi Shimada
- 👤 Ken Kumata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 13:44
CPC Classifications
G; G02; G02B; G02B6/00; G02B6/10; G02B6/102; C; C03; C03C; C03C13/00; C03C13/04; C03C13/048
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
29 words
In a hollow-core optical waveguide for use in the middle infrared band, the improvement which comprises having a clad part thereof formed of glass consisting preponderantly of germanium dioxide.
Claim 2
Dependent Claim
29 words
In a hollow-core optical waveguide for use in the middle infrared band, the improvement which comprises having a clad part thereof formed of glass consisting preponderantly of germanium dioxide.
Claim 3
Dependent Claim
57 words
A hollow-core optical waveguide according to claim 1, wherein the clad part thereof is formed of glass composed of 60 to 90 mole % of germanium dioxide, 5 to 20 mole % of potassium oxide, and 5 to 30 mole % of one member selected from the group consisting of zinc oxide, aluminum oxide, and zirconium oxide.
Claim 4
Dependent Claim
38 words
A hollow-core optical waveguide according to claim 1, wherein the clad part thereof is formed of glass composed of 80 mole % of germanium dioxide, 10 mole % of zinc oxide, and 10 mole % of potassium oxide.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-06-12 | 1987-12-12 | 1988-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-12 | 1991-12-12 | 1992-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-12 | 1995-12-12 | 1996-06-12 | $7700.00 | Window Closed / Lapsed |