US3105290A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cathode for electron discharge device
Assignee: Westinghouse Electric Corp
•
Filing: 1958-12-18
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Granted: 1963-10-01
•
Expires: 1978-12-18
Abstract
No abstract record available.
Inventors
- 👤 James P Sackinger
- 👤 Gene R Feaster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:48
CPC Classifications
H; H01; H01J; H01J9/00; H01J9/02; H01J9/04; H01J9/042; H01J1/00; H01J1/02; H01J1/13; H01J1/20; H01J1/28
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
173 words
A METHOD OF MAKING A REFRACTORY CATHODE COMPRISING THE STEPS OF ESTABLISHING A QUANTITY OF POWDERED MATERIAL CONSISTING ESSENTIALLY OF BY WEIGHT: 0.002% TO 5% OF THORIUM CONTAINING MATERIAL SELECTED FFROM THE GROUP CONSISTING OF THORIUM AND THORIUM HYDRIDE, 60% TO 98% OF AT LEAST ONE FIRST REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN, MOLYBDENUM AND RHENIUM; 1% TO 30% OF AT LEAST ONE REFRACTORY METAL CARBIDE SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN CARBIDE, DITUNGSTEN CARBIDE, MOLYBDENUM CARBIDE AND DIMOLYDENUM CARBIDE; AND 0.05% TO 9.8% OF AT LEAST ONE SECOND REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, NIOBIUM, XIRCONIUM, HAFNIUM, OSMIUM, RUTHENIUM AND IRIDIUM; FORMING A FIRST MIXTURE OF SAID THORIUM CONTAINING MATERIAL AND SAID SECOND REFRACTORY METAL; HEATING SAID FIRST MIXTURE TO A TEMPERATURE OF AT LEAST 1850*C. TO FORM AN ALLOY; DIVIDING SAID ALLOY INTO A POWDER; FORMING A SECOND MIXTURE OF SAID ALLOY, SAID FIRST REFRACTORY METAL AND SAID REFRACTORY METAL CARBIDE AND HEATING SAID SECOND MIXTURE TO ABOUT 2000*C. TO PRODUCE A SINTERED MASS.
Claim 2
Independent Claim
173 words
A METHOD OF MAKING A REFRACTORY CATHODE COMPRISING THE STEPS OF ESTABLISHING A QUANTITY OF POWDERED MATERIAL CONSISTING ESSENTIALLY OF BY WEIGHT: 0.002% TO 5% OF THORIUM CONTAINING MATERIAL SELECTED FFROM THE GROUP CONSISTING OF THORIUM AND THORIUM HYDRIDE, 60% TO 98% OF AT LEAST ONE FIRST REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN, MOLYBDENUM AND RHENIUM; 1% TO 30% OF AT LEAST ONE REFRACTORY METAL CARBIDE SELECTED FROM THE GROUP CONSISTING OF TUNGSTEN CARBIDE, DITUNGSTEN CARBIDE, MOLYBDENUM CARBIDE AND DIMOLYDENUM CARBIDE; AND 0.05% TO 9.8% OF AT LEAST ONE SECOND REFRACTORY METAL SELECTED FROM THE GROUP CONSISTING OF TANTALUM, NIOBIUM, XIRCONIUM, HAFNIUM, OSMIUM, RUTHENIUM AND IRIDIUM; FORMING A FIRST MIXTURE OF SAID THORIUM CONTAINING MATERIAL AND SAID SECOND REFRACTORY METAL; HEATING SAID FIRST MIXTURE TO A TEMPERATURE OF AT LEAST 1850*C. TO FORM AN ALLOY; DIVIDING SAID ALLOY INTO A POWDER; FORMING A SECOND MIXTURE OF SAID ALLOY, SAID FIRST REFRACTORY METAL AND SAID REFRACTORY METAL CARBIDE AND HEATING SAID SECOND MIXTURE TO ABOUT 2000*C. TO PRODUCE A SINTERED MASS.
References Cited (Backward Citations)
US1205080A
Cited
US1732326A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-09-30 | 1967-04-01 | 1967-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-09-30 | 1971-04-01 | 1971-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-09-30 | 1975-04-01 | 1975-10-01 | $7700.00 | Window Closed / Lapsed |