US3699378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electron discharge device thermionic cathode having reduced operating temperature and method of making same
Assignee: GTE Sylvania Inc
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Filing: 1971-06-30
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Granted: 1972-10-17
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Expires: 1991-06-30
Abstract
Abstract Reduction of thermionic cathode operating temperature is accomplished by the inclusion in the emissive coating of amounts of nickel coated carbonates which can ordinarily vary between more than 0 percent and up to about less than 25 percent by weight of the emissive material without adversely effecting emission. The nickel coated carbonates contain from about 2 percent to about 7 percent by weight nickel.
Inventors
- 👤 William E Buescher
- 👤 Donald R Kerstetter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:09
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31678
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3393090A
Cited
US3615901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-17 | 1976-04-17 | 1976-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-17 | 1980-04-17 | 1980-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-17 | 1984-04-17 | 1984-10-17 | $7700.00 | Window Closed / Lapsed |