US2810890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Waveguide filter
Assignee: RCA Corp
•
Filing: 1954-11-23
•
Granted: 1957-10-22
•
Expires: 1974-11-23
Abstract
No abstract record available.
Inventors
- 👤 Ralph W Klopfenstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 12:38
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213; H01P1/2138
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2607849A
Cited
US2458579A
Cited
US2713151A
Cited
US2651759A
Cited
US2514779A
Cited
US2709240A
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 |