US3538463A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave filter
Assignee: ARF Products Inc
•
Filing: 1966-11-22
•
Granted: 1970-11-03
•
Expires: 1986-11-22
Abstract
No abstract record available.
Inventors
- 👤 John J Pakan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 11:35
CPC Classifications
H; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/205
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2163775A
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US2402540A
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US2753530A
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US2749523A
Cited
US2877433A
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US3074035A
Cited
US3065434A
Cited
US3159803A
Cited
US3247475A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-02 | 1974-05-04 | 1974-11-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-02 | 1978-05-04 | 1978-11-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-02 | 1982-05-04 | 1982-11-03 | $7700.00 | Window Closed / Lapsed |