Patent US2666196A successfully refreshed from Google Patents.
US2666196A
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Frequency station calling system using bifurcated piezoelectric elements
Assignee: AT&T Inc
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Filing: 1949-06-07
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Granted: 1954-01-12
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Expires: 1969-06-07
Abstract
No abstract record available.
Inventors
- 👤 Thomas G Kinsley
- 👤 Warren P Mason
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:44
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/05; H03H9/10; H03H9/1007; H03H9/1014; H03H9/1021; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; G04F5/063; H01; H01H; H01H51/00; H01H51/30; H01H51/32; H03H9/46; H03H9/54; H03H9/545; H04; H04W; H04W88/00; H04W88/02; H04W88/022; H04W88/025; H04W88/027
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-01-11 | 1957-07-13 | 1958-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-01-11 | 1961-07-13 | 1962-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-01-11 | 1965-07-13 | 1966-01-12 | $7700.00 | Window Closed / Lapsed |