US999987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for producing high-frequency currents.
Assignee: Individual
•
Filing: 1908-08-26
•
Granted: 1911-08-08
•
Expires: 1928-08-26
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Goldschmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:15
CPC Classifications
H; H02; H02K; H02K47/00; H02K47/18; H02K47/22; H02K47/28
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) | 1914-08-07 | 1915-02-06 | 1915-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1918-08-07 | 1919-02-06 | 1919-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1922-08-07 | 1923-02-06 | 1923-08-08 | $7700.00 | Window Closed / Lapsed |