US2989699A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-mode standing wave indicator
Assignee: PRD ELECTRONICS Inc
•
Filing: 1955-09-07
•
Granted: 1961-06-20
•
Expires: 1975-09-07
Abstract
No abstract record available.
Inventors
- 👤 Hopfer Samuel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 13:36
CPC Classifications
G; G01; G01R; G01R27/00; G01R27/02; G01R27/04; G01R27/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2413939A
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US2488378A
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US2573746A
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US2571055A
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US2579327A
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US2591980A
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US2642494A
Cited
US2783378A
Cited
US2644884A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-19 | 1964-12-19 | 1965-06-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-19 | 1968-12-19 | 1969-06-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-19 | 1972-12-19 | 1973-06-20 | $7700.00 | Window Closed / Lapsed |