US2625666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filament for electron tubes
Assignee: Varian Medical Systems Inc
•
Filing: 1950-02-27
•
Granted: 1953-01-13
•
Expires: 1970-02-27
Abstract
No abstract record available.
Inventors
- 👤 Paul D Williams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:50
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A FILAMENT FOR ELECTRON TUBES COMPRISING A BUNDLE OF TWISTED STRANDS OF THORIATED TUNGSTEN WIRE, PORTIONS OF THE STRANDED FILAMENT BEING CARBURIZED, SAID CARBURIZED PORTIONS BEING SO DISPOSED RELATIVE TO THE FILAMENT AXIS AS TO PROVIDE
Claim 2
Dependent Claim
36 words
A FILAMENT FOR ELECTRON TUBES COMPRISING A BUNDLE OF TWISTED STRANDS OF THORIATED TUNGSTEN WIRE, PORTIONS OF THE STRANDED FILAMENT BEING CARBURIZED, SAID CARBURIZED PORTIONS BEING SO DISPOSED RELATIVE TO THE FILAMENT AXIS AS TO PROVIDE
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Cited
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-01-13 | 1956-07-14 | 1957-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-01-13 | 1960-07-14 | 1961-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-01-13 | 1964-07-14 | 1965-01-13 | $7700.00 | Window Closed / Lapsed |