Patent US1216538A successfully refreshed from Google Patents.
US1216538A
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Means for producing electrical oscillations.
Assignee: Gesesellschaft fur Drahtlose Telegraphie M B H
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Filing: 1917-01-08
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Granted: 1917-02-20
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Expires: 1937-01-08
Abstract
No abstract record available.
Inventors
- 👤 Georg Graf Arco
- 👤 Ragnar Haakan Rendahl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 08:32
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/74
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) | 1920-02-20 | 1920-08-21 | 1921-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1924-02-20 | 1924-08-21 | 1925-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1928-02-20 | 1928-08-21 | 1929-02-20 | $7700.00 | Window Closed / Lapsed |