US3446975A
Expired / Lapsed
US
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Acousto-electric filter utilizing surface wave propagation in which the center frequency is determined by a conductivity pattern resulting from an optical image
Assignee: Zenith Electronics LLC
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Filing: 1966-11-07
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Granted: 1969-05-27
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Expires: 1986-11-07
Abstract
No abstract record available.
Inventors
- 👤 Robert Adler
- 👤 Adrian J De Vries
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:29
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/64; H03H9/6403; H03H9/02; H03H9/02535; H03H9/0296; H03H9/02968
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3234488A
Cited
US3202824A
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US3185942A
Cited
US3274406A
Cited
US3353891A
Cited
US3360749A
Cited
US3360327A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-05-26 | 1972-11-25 | 1973-05-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-26 | 1976-11-25 | 1977-05-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-26 | 1980-11-25 | 1981-05-27 | $7700.00 | Window Closed / Lapsed |