Patent US2028212A successfully refreshed from Google Patents.
US2028212A
Expired / Lapsed
US
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Radio transmitting system
Assignee: AT&T Inc
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Filing: 1933-12-22
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Granted: 1936-01-21
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Expires: 1953-12-22
Abstract
No abstract record available.
Inventors
- 👤 Raymond A Heising
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:55
CPC Classifications
H; H04; H04J; H04J1/00; H04B; H04B1/00; H04B1/02; H04B1/04; H04B1/0483; H04H; H04H20/00; H04H20/28; H04H20/33; H04H20/65; H04H20/71; H04H20/72
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) | 1939-01-20 | 1939-07-22 | 1940-01-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1943-01-20 | 1943-07-22 | 1944-01-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1947-01-20 | 1947-07-22 | 1948-01-21 | $7700.00 | Window Closed / Lapsed |