US3660291A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magneto-optical elements and glasses
Assignee: Corning Glass Works
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Filing: 1970-01-19
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Granted: 1972-05-02
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Expires: 1990-01-19
Abstract
Abstract THE INVENTION RELATES TO MAGNETO-OPTICAL ELEMENTS SUCH AS SWITCHES, MODULATORS AND ISOLATORS HAVING VERY HIGH VERDET CONSTANTS. THE ELEMENTS ARE PRODUCED FROM GLASSES COMPOSED ESSENTIALLY OF SILICA (SIO2) AS A GLASS FORMER, A RARE EARTH METAL OXIDE AS A PRIMARY MODIFIER, AND ONE OR MORE STABILIZING OXIDES SELECTED FROM THE GROUP CONSISTING OF ZRO2, TIO2 AND NB2O5 AS SECONDARY MODIFIERS.
Inventors
- 👤 Guy E Stong
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 23:36
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/0009; G02F1/0036; C; C03; C03C; C03C3/00; C03C3/04; C03C3/062
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-05-02 | 1975-11-01 | 1976-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-02 | 1979-11-01 | 1980-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-02 | 1983-11-01 | 1984-05-02 | $7700.00 | Window Closed / Lapsed |