Patent US4398091A successfully refreshed from Google Patents.
Patent US2226686A successfully refreshed from Google Patents.
US2226686A
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US
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High frequency transmission network
Assignee: Mackay Radio & Telegraph Co
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Filing: 1937-11-16
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Granted: 1940-12-31
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Expires: 1957-11-16
Abstract
No abstract record available.
Inventors
- 👤 Alford Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:06
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H01Q; H01Q5/00; H01Q5/30; H01Q5/307; H01Q5/314; H01Q5/335; H01Q5/50
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1943-12-31 | 1944-07-01 | 1944-12-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-12-31 | 1948-07-01 | 1948-12-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-12-31 | 1952-07-01 | 1952-12-31 | $7700.00 | Window Closed / Lapsed |