Patent US20060111660A1 successfully refreshed from Google Patents.
US2008857A
Expired / Lapsed
US
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Mechanical impedance meter
Assignee: AT&T Inc
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Filing: 1933-04-04
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Granted: 1935-07-23
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Expires: 1953-04-04
Abstract
No abstract record available.
Inventors
- 👤 Paul B Flanders
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:08
CPC Classifications
H; H04; H04R; H04R29/00
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) | 1938-07-22 | 1939-01-21 | 1939-07-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1942-07-22 | 1943-01-21 | 1943-07-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1946-07-22 | 1947-01-21 | 1947-07-23 | $7700.00 | Window Closed / Lapsed |