US2222048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the production of electric oscillations
Assignee: Hitachi Rail STS USA Inc
•
Filing: 1940-02-21
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Granted: 1940-11-19
•
Expires: 1960-02-21
Abstract
No abstract record available.
Inventors
- 👤 Stevens Sydney Arthur
- 👤 Walker Alec Hervey Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:24
CPC Classifications
H; H03; H03C; H03C1/00; H03C1/52; H03C1/54; H03C1/56; H03C1/58; H03B; H03B19/00; H03B19/03
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) | 1943-11-19 | 1944-05-20 | 1944-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1947-11-19 | 1948-05-20 | 1948-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1951-11-19 | 1952-05-20 | 1952-11-19 | $7700.00 | Window Closed / Lapsed |