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US2248239A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Phase shifting network
Assignee: Individual
•
Filing: 1938-08-15
•
Granted: 1941-07-08
•
Expires: 1958-08-15
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Jarvis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:39
CPC Classifications
H; H03; H03H; H03H11/00; H03H11/02; H03H11/16; H03H11/18
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) | 1944-07-07 | 1945-01-06 | 1945-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-07-07 | 1949-01-06 | 1949-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-07-07 | 1953-01-06 | 1953-07-08 | $7700.00 | Window Closed / Lapsed |