Patent US3030500A successfully refreshed from Google Patents.
US3030500A
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Communication system utilizing trade wind inversion duct
Assignee: ELECTROMAGNETIC RES CORP
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Filing: 1959-01-15
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Granted: 1962-04-17
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Expires: 1979-01-15
Abstract
No abstract record available.
Inventors
- 👤 Katzin Martin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 10:10
CPC Classifications
H; H04; H04B; H04B7/00; H04B7/14; H04B7/15; H04B7/185
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2598064A
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US2431018A
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US2626348A
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US2542823A
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US2504884A
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US2579591A
Cited
US2627021A
Cited
US2748266A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |