US4445755A
Expired / Lapsed
US
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Infrared transmitting optical wave guide
Assignee: DIRECTOR-GENERAL OF AGENCY OF INDUSTRIAL SCIENCE AND TECHNOLOGY A CORP OF JAPAN
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Filing: 1982-03-16
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Granted: 1984-05-01
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Expires: 2002-03-16
Abstract
Abstract Fluorozirconate glasses containing sodium fluoride and aluminum fluoride are used to improve an infrared transmitting fluoride glass optical wave guides thereby to obtain optical wave guides having high numerical aperture.
Inventors
- 👤 Kazuya Ohsawa
- 👤 Toshiaki Shibata
- 👤 Kenichi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 02:33
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/32; C03C3/325; G; G02; G02B; G02B6/00; G02B6/10; G02B6/102
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
103 words
An infrared transmitting optical wave guide formed of a core glass and a cladding glass having a smaller refractive index than said core glass, wherein both core and cladding glass comprise 52 to 69 mol% of zirconium fluoride, 10 to 24 mol% of barium fluoride, 1 to 7 mol% of lanthanum fluoride, 9 to 25 mol% of sodium fluoride and 2 to 5 mol% of aluminum fluoride; the total content of said zirconium fluoride, barium fluoride, lanthanum fluoride and sodium fluoride is chosen to be over 90 mol%; and the cladding glass contains a larger amount of sodium fluoride than the core glass.
Claim 2
Dependent Claim
103 words
An infrared transmitting optical wave guide formed of a core glass and a cladding glass having a smaller refractive index than said core glass, wherein both core and cladding glass comprise 52 to 69 mol% of zirconium fluoride, 10 to 24 mol% of barium fluoride, 1 to 7 mol% of lanthanum fluoride, 9 to 25 mol% of sodium fluoride and 2 to 5 mol% of aluminum fluoride; the total content of said zirconium fluoride, barium fluoride, lanthanum fluoride and sodium fluoride is chosen to be over 90 mol%; and the cladding glass contains a larger amount of sodium fluoride than the core glass.
Claim 3
Dependent Claim
90 words
The infrared transmitting optical wave guide according to claim 1, wherein the core glass comprises: 54 to 68 mol% of zirconium fluoride; 14 to 23 mol% of barium fluoride; 3 to mol% of lanthanum fluoride; 10 to 20 ml% of sodium fluoride; and 3 to 4.5 mol% of aluminum fluoride, the cladding glass comprises: 54 to 68 mol% of zirconium fluoride; 11 to 20 mol% of barium fluoride; 3 to 6 mol% of lanthanum fluoride; 15 to 24 mol% of sodium fluoride; and 3 to 4.5 mol% of aluminum fluoride.
References Cited (Backward Citations)
US4328318A
Cited
US4343638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-01 | 1987-10-31 | 1988-05-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-01 | 1991-10-31 | 1992-05-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-01 | 1995-10-31 | 1996-05-01 | $7700.00 | Window Closed / Lapsed |