US3564460A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Folded path perpendicular diffraction delay line
Assignee: AT&T Inc
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Filing: 1967-12-18
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Granted: 1971-02-16
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Expires: 1987-12-18
Abstract
Abstract AN INTERMEDIARY GRADED GRATING, WHICH MAY BE TRANSMITTING, IS POSITIONED IN THE BEAM PATH BETWEEN THE INPUT AND OUTPUT GRADED GRATINGS USUALLY FOUNDED IN A PERPENDICULAR DIFFRACTION DELAY LINE. THE INTERMEDIARY GRATING INTERCEPTS THE BEAMS AND REDIFFRACTS DESIRED ORDERS OF THEM TO THE OUTPUT GRATING WITHOUT LOSS OF THE INHERENT AVERAGING PROPERTIES OF THE PERPENDICULAR DIFFRACTION DELAY LINE.
Inventors
- 👤 Erhard K Sittig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:47
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/40
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) | 1974-02-15 | 1974-08-17 | 1975-02-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-15 | 1978-08-17 | 1979-02-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-15 | 1982-08-17 | 1983-02-16 | $7700.00 | Window Closed / Lapsed |