US2810888A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromechanical filter
Assignee: RCA Corp
•
Filing: 1954-08-03
•
Granted: 1957-10-22
•
Expires: 1974-08-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph W George
- 👤 Walter Van B Roberts
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:23
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/48; H03H9/50; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49016
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1689339A
Cited
US1852795A
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US1933306A
Cited
US2318417A
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US2495740A
Cited
US2667621A
Cited
US2656516A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-10-21 | 1961-04-22 | 1961-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-10-21 | 1965-04-22 | 1965-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-10-21 | 1969-04-22 | 1969-10-22 | $7700.00 | Window Closed / Lapsed |