Patent US3633992A successfully refreshed from Google Patents.
US3633992A
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Faraday-effect element
Assignee: Nippon Selfoc Co Ltd
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Filing: 1969-07-07
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Granted: 1972-01-11
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Expires: 1989-07-07
Abstract
Abstract A novel Faraday-effect element having a refractive index highest along the axis and decreasing toward the surface is produced by immersing a thin elongated glass body containing an oxide selected from the group consisting of paramagnetic- and diamagnetic-type oxides composed of at least first cations, in a bath of salt including second cations having a smaller ration of the electronic polarizability to the third power of the ion radius than said first cations. The bath is maintained at a temperature to permit said second cations to diffuse into said glass body so that said first cations may be substituted by said second cations.
Inventors
- 👤 Teiji Uchida
- 👤 Motoaki Furukawa
- 👤 Shogo Yochikawa
- 👤 Ichiro Kitano
- 👤 Ken Koizumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:53
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/09; G02F1/095; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C03C3/07; C03C3/076; C03C3/102; C03C3/12; C03C3/14; G02F1/0009; G02F1/0036
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
105 words
A Faraday-effect element made of fibrous cylindrical glass disposed in a magnetic field substantially parallel to the cylindrical glass axis, said glass containing at the said axis 2 to 65 percent by weight of Tl2O, less than 75 percent by weight of PbO, and 15 to 70 percent by weight of SiO2, wherein the concentration of Tl2O decreases continuously toward the surface of said glass, whereby the refractive index nr of said glass decreases substantially according to the relation nr no(1- ar2) where no is the refractive index at said axis, r is the radial distance from said axis, and a is a positive constant.
Claim 2
Dependent Claim
105 words
A Faraday-effect element made of fibrous cylindrical glass disposed in a magnetic field substantially parallel to the cylindrical glass axis, said glass containing at the said axis 2 to 65 percent by weight of Tl2O, less than 75 percent by weight of PbO, and 15 to 70 percent by weight of SiO2, wherein the concentration of Tl2O decreases continuously toward the surface of said glass, whereby the refractive index nr of said glass decreases substantially according to the relation nr no(1- ar2) where no is the refractive index at said axis, r is the radial distance from said axis, and a is a positive constant.
Claim 3
Dependent Claim
26 words
A Faraday-effect element as claimed in claim 1, wherein the two end surfaces of said element are polished into optically smooth surfaces normal to said axis.
Claim 4
Dependent Claim
32 words
A Faraday-effect element as claimed in claim 1, wherein said element is rectilinear and disposed in parallel with the magnetic field generated by a solenoid along whose axis said element is disposed.
Claim 5
Dependent Claim
36 words
A Faraday-effect element as claimed in claim 1, wherein said element is formed into a helix and disposed in parallel with the magnetic field generated by a rectilinear conductor laid along the axis of said helix.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |