Patent US1708950A successfully refreshed from Google Patents.
US1708950A
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US
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Electric wave filter
Assignee: AT&T Inc
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Filing: 1925-05-12
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Granted: 1929-04-16
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Expires: 1945-05-12
Abstract
No abstract record available.
Inventors
- 👤 Edward L Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:32
CPC Classifications
H; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/143; H03; H03H; H03H7/00; H03H7/01; H03H7/0115; H03H7/17; H03H7/1741; H03H7/175; H03H7/1766; H03H7/1775
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) | 1932-04-15 | 1932-10-15 | 1933-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1936-04-15 | 1936-10-15 | 1937-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1940-04-15 | 1940-10-15 | 1941-04-16 | $7700.00 | Window Closed / Lapsed |