US2690982A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Coated electrode
Assignee: Lewis and Kaufman Inc
•
Filing: 1952-02-05
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Granted: 1954-10-05
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Expires: 1972-02-05
Abstract
No abstract record available.
Inventors
- 👤 Frederick W Gillmeister
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:27
CPC Classifications
H; H01; H01J; H01J19/00; H01J19/28; H01J19/30; H01J2893/00; H01J2893/0001; H01J2893/0012; H01J2893/0019; H01J2893/002; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12104; Y10T428/12111; Y10T428/12493; Y10T428/12771; Y10T428/12806; Y10T428/12812
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
AN ELECTRODE FOR THERMIONIC VACUUM TUBES COMPRISING A BASE OF MOLYBDENUM AND A RADIATING AND GETTERING COATING ON SAID BASE CONSISTING ESSENTIALLY OF A MIXTURE OF ZIRCONIUM AND MOLYBDENUM POWDERS SECURED TO SAID BASE BY AN ADHESIVE BINDER, THE PROPORTION OF ZIRCONIUM IN SAID MIXTURE BEING AT LEAST FIFTY PERCENT BY WEIGHT AND THE PROPORTION OF MOLYBDENUM BEING SUFFICIENT TO FORM A COATING HAVING A RADIANT EMISSIVITY MATERIALLY GREATER THAN THAT OF A COATING CONSISTING ESSENTIALLY OF ZIRCONIUM POWDER IN A BINDER.
Claim 2
Dependent Claim
82 words
AN ELECTRODE FOR THERMIONIC VACUUM TUBES COMPRISING A BASE OF MOLYBDENUM AND A RADIATING AND GETTERING COATING ON SAID BASE CONSISTING ESSENTIALLY OF A MIXTURE OF ZIRCONIUM AND MOLYBDENUM POWDERS SECURED TO SAID BASE BY AN ADHESIVE BINDER, THE PROPORTION OF ZIRCONIUM IN SAID MIXTURE BEING AT LEAST FIFTY PERCENT BY WEIGHT AND THE PROPORTION OF MOLYBDENUM BEING SUFFICIENT TO FORM A COATING HAVING A RADIANT EMISSIVITY MATERIALLY GREATER THAN THAT OF A COATING CONSISTING ESSENTIALLY OF ZIRCONIUM POWDER IN A BINDER.
References Cited (Backward Citations)
US2368060A
Cited
US2536673A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-10-04 | 1958-04-05 | 1958-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-10-04 | 1962-04-05 | 1962-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-10-04 | 1966-04-05 | 1966-10-05 | $7700.00 | Window Closed / Lapsed |