US2830289A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Broad band echo box
Assignee: General Precision Laboratory Inc
•
Filing: 1953-04-02
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Granted: 1958-04-08
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Expires: 1973-04-02
Abstract
No abstract record available.
Inventors
- 👤 John F Zaleski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 21:07
CPC Classifications
H; H01; H01P; H01P7/00; H01P7/06; G; G01; G01S; G01S1/00; G01S1/02; G01S7/00; G01S7/02; G01S7/40; G01S7/4004; G01S7/4021; H01P1/00; H01P1/165; H01P1/175
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2502456A
Cited
US2537139A
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US2476034A
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US2632808A
Cited
US2644930A
Cited
US2704830A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-04-07 | 1961-10-07 | 1962-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-04-07 | 1965-10-07 | 1966-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-04-07 | 1969-10-07 | 1970-04-08 | $7700.00 | Window Closed / Lapsed |