US3676695A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Nonlinear optical devices utilizing substantially hexagonal silicon carbide devices
Assignee: AT&T Inc
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Filing: 1971-07-23
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Granted: 1972-07-11
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Expires: 1991-07-23
Abstract
Abstract Optical devices depending for their function upon the incorporation of substantially hexagonal silicon carbide are useful for electromagnetic radiation frequency conversion at near infrared wavelengths. Such devices may be operated inter alia as second harmonic generators or as parametric downshifters.
Inventors
- 👤 Shobha Singh
- 👤 Le Grand Gerard Van Uitert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:19
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/35; G02F1/39
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
22 words
Device of claim 1 in which at least one of the said wavelength components has a wavelength of greater than one micrometer.
Claim 2
Dependent Claim
17 words
Device of claim 1 in which at least one of said means comprises an optically polished surface.
Claim 3
Dependent Claim
25 words
Device of claim 1 together with resonant means for supporting a standing wave of at least one of the said frequencies in the said body.
Claim 4
Dependent Claim
36 words
Device of claim 1 in which there are coherent electromagnetic waves of three frequencies within the said body and the frequency relationship is such that the greatest is equal to the sum of the other two.
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) | 1975-07-11 | 1976-01-10 | 1976-07-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-11 | 1980-01-10 | 1980-07-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-11 | 1984-01-10 | 1984-07-11 | $7700.00 | Window Closed / Lapsed |