US3701584A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tuned voltage variable birefringent acousto-optical filter
Assignee: AT&T Inc
•
Filing: 1970-12-21
•
Granted: 1972-10-31
•
Expires: 1990-12-21
Abstract
Abstract A VOLTAGE TUNABLE ACOUSTO-OPTICAL FILTER WITH REDUCED POWER REQUIREMENTS ACTS AS A BANDPASS OPTICAL FILTER WITH ITS CENTER FREQUENCY DETERMINED BY A DC VOLTAGE SOURCE. PRIOR ART ACOUSTO-OPTICAL FILTERS RELY ON THE NATURAL BIREFRINGENCE OF THE FILTER CRYSTALS, HENCE A CHANGE IN THE OUTPUT OPTICAL FREQUENCY IS ACCOMPLISHED BY A CHANGE IN THE ACOUSTICAL FREQUENCY ESTABLISHED IN THE CRYSTAL. HOWEVER, THE ACOUSTICAL FREQUENCY CAN BE FIXED AND THE OUTPUT OPTICAL FREQUENCY CHANGED BY VARYING THE BIREFRINGENCE OF THE CRYSTAL WITH THE APPLICATION OF A VOLTAGE TO A SET OF ELECTRODES ON THE CRYSTAL.
Inventors
- 👤 Peter Klaus Runge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:13
CPC Classifications
G; G02; G02F; G02F1/00; G02F1/01; G02F1/11; G02F1/116
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-10-31 | 1976-05-01 | 1976-10-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-31 | 1980-05-01 | 1980-10-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-31 | 1984-05-01 | 1984-10-31 | $7700.00 | Window Closed / Lapsed |