US2701338A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency dividing filter for multifrequency antenna systems
Assignee: Douglas Aircraft Co Inc
•
Filing: 1950-10-30
•
Granted: 1955-02-01
•
Expires: 1970-10-30
Abstract
No abstract record available.
Inventors
- 👤 Joseph M Boyer
- 👤 Vernon L Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:44
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/213
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2227384A
Cited
US2422458A
Cited
US2419557A
Cited
US2426633A
Cited
US2579152A
Cited
US2550409A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-01-31 | 1958-08-02 | 1959-02-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-01-31 | 1962-08-02 | 1963-02-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-01-31 | 1966-08-02 | 1967-02-01 | $7700.00 | Window Closed / Lapsed |