Patent US2591936A successfully refreshed from Google Patents.
US2591936A
Expired / Lapsed
US
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Transmission network for emphasizing the high-frequencies of applied oscillations
Assignee: Hartford National Bank and Trust Co
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Filing: 1947-02-12
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Granted: 1952-04-08
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Expires: 1967-02-12
Abstract
No abstract record available.
Inventors
- 👤 Hepp Gerard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:41
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/06; H03C; H03C3/00; H03H7/09; H03H7/17; H03H7/1741; H03H7/1758; H03H7/1775; H03H7/1791; H04; H04B; H04B14/00; H04B14/002; H04B14/006
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2043774A
Cited
US2159944A
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US1976504A
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US1959494A
Cited
US2025128A
Cited
US2176200A
Cited
US2282113A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-04-08 | 1955-10-08 | 1956-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-08 | 1959-10-08 | 1960-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-08 | 1963-10-08 | 1964-04-08 | $7700.00 | Window Closed / Lapsed |