Patent US2242249A successfully refreshed from Google Patents.
US2242249A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical converter
Assignee: Leland Stanford Junior University
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Filing: 1938-06-18
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Granted: 1941-05-20
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Expires: 1958-06-18
Abstract
No abstract record available.
Inventors
- 👤 Sigurd F Varian
- 👤 William W Hansen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:33
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/06; H01J25/10; H01J25/12; H01J25/20; H01J25/22; H01J25/24; H03; H03D; H03D7/00; H03D7/20
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) | 1944-05-19 | 1944-11-18 | 1945-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-05-19 | 1948-11-18 | 1949-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-05-19 | 1952-11-18 | 1953-05-20 | $7700.00 | Window Closed / Lapsed |