Patent US2807743A successfully refreshed from Google Patents.
Patent US2190131A successfully refreshed from Google Patents.
US2190131A
Expired / Lapsed
US
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Reentrant network
Assignee: Mackay Radio & Telegraph Co
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Filing: 1937-01-02
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Granted: 1940-02-13
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Expires: 1957-01-02
Abstract
No abstract record available.
Inventors
- 👤 Alford Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:22
CPC Classifications
H; H01; H01P; H01P5/00; H01P5/02; H03; H03B; H03B5/00; H03B5/18; H03B5/1817; H03B5/1835; H03L; H03L7/00; H03L7/02; H03L7/04
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) | 1943-02-12 | 1943-08-14 | 1944-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-02-12 | 1947-08-14 | 1948-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-02-12 | 1951-08-14 | 1952-02-13 | $7700.00 | Window Closed / Lapsed |