US2727178A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Thoriated cathode
Assignee: Westinghouse Electric Corp
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Filing: 1952-03-25
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Granted: 1955-12-13
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Expires: 1972-03-25
Abstract
No abstract record available.
Inventors
- 👤 Hampton J Dailey
- 👤 Carl H Scullin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:03
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/15
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
20 words
A THORIATED TUNGSTEN CATHODE ESSENTIALLY ENCLOSING A CARBON SECTION WITH A SPACE SEPARATING THE SAME THROGHOUT THE MAJOR PORTIONS THEREOF.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-12 | 1959-06-13 | 1959-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-12 | 1963-06-13 | 1963-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-12 | 1967-06-13 | 1967-12-13 | $7700.00 | Window Closed / Lapsed |