Patent US2789250A successfully refreshed from Google Patents.
US2789250A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High frequency device
Assignee: Varian Medical Systems Inc
•
Filing: 1952-07-30
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Granted: 1957-04-16
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Expires: 1972-07-30
Abstract
No abstract record available.
Inventors
- 👤 Sigurd F Varian
- 👤 Donald L Snow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:32
CPC Classifications
H; H01; H01J; H01J25/00; H01J25/02; H01J25/22; H01J25/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2391016A
Cited
US2421635A
Cited
US2491971A
Cited
US2527770A
Cited
US2659028A
Cited
US2658147A
Cited
US2517731A
Cited
US2555349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-15 | 1960-10-15 | 1961-04-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-15 | 1964-10-15 | 1965-04-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-15 | 1968-10-15 | 1969-04-16 | $7700.00 | Window Closed / Lapsed |