Patent US2726178A successfully refreshed from Google Patents.
US2726178A
Expired / Lapsed
US
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Thermionic cathode with thoria coating
Assignee: RCA Corp
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Filing: 1950-11-17
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Granted: 1955-12-06
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Expires: 1970-11-17
Abstract
No abstract record available.
Inventors
- 👤 Nelson Herbert
- 👤 Mark N Fredenburgh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:26
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/13; H01J1/14; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2913; Y10T428/2933; Y10T428/294; Y10T428/2958; Y10T428/298
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
75 words
METHOD OF APPLYING TO A FILAMENTARY BASE A THORIA COATING HAVING A RELATIVELY HIGH APPARENT DENSITY AND GOOD ADHERENCE TO SAID BASE, COMPRISING SPRAYING SAID BASE UNDER CONDITIONS TO PROVIDE A FLUFFY COATING WITH A COATING MIXTURE CONSISTING OF SUBSTANTIALLY PORELESS THORIA PARTICLES HAVING AN OVERALL SIZE RANGE OF FROM .01 TO 1.5 MICRONS IN DIAMETER AND WITH ABOUT 50% OF THE PARTICLES INCLUDED WITHIN A SUB-SIZE RANGE OF FROM .05 .10 MICRON IN DIAMETER.
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) | 1958-12-05 | 1959-06-06 | 1959-12-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-05 | 1963-06-06 | 1963-12-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-05 | 1967-06-06 | 1967-12-06 | $7700.00 | Window Closed / Lapsed |