Patent US2617882A successfully refreshed from Google Patents.
US2617882A
Expired / Lapsed
US
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Maximal flatness filter
Assignee: RCA Corp
•
Filing: 1950-05-29
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Granted: 1952-11-11
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Expires: 1970-05-29
Abstract
No abstract record available.
Inventors
- 👤 Walter Van B Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:24
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/50; H03H9/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1603806A
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US1788519A
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US1849656A
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US2020377A
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US2001387A
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US2231404A
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US2501488A
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US2571019A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-11-11 | 1956-05-12 | 1956-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-11-11 | 1960-05-12 | 1960-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-11-11 | 1964-05-12 | 1964-11-11 | $7700.00 | Window Closed / Lapsed |