US2259690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency radio apparatus
Assignee: Leland Stanford Junior University
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Filing: 1939-04-20
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Granted: 1941-10-21
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Expires: 1959-04-20
Abstract
No abstract record available.
Inventors
- 👤 William W Hansen
- 👤 Russell H Varian
- 👤 John R Woodyard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:13
CPC Classifications
H; H03; H03D; H03D7/00; H03D7/20; H01; H01J; H01J25/00; H01J25/02; H01J25/06; H01J25/10; H01J25/12; H01J25/20; H01J25/22; H01J25/24; H01J25/30
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) | 1944-10-20 | 1945-04-21 | 1945-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1948-10-20 | 1949-04-21 | 1949-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1952-10-20 | 1953-04-21 | 1953-10-21 | $7700.00 | Window Closed / Lapsed |