Patent US2798808A successfully refreshed from Google Patents.
US2798808A
Expired / Lapsed
US
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Method of introducing zirconia into tungsten powder preliminary to forming electrodes
Assignee: Westinghouse Electric Corp
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Filing: 1953-02-02
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Granted: 1957-07-09
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Expires: 1973-02-02
Abstract
No abstract record available.
Inventors
- 👤 Charles V Iredell
- 👤 Harry C Milbank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:31
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/222
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
105 words
THE METHOD OF INTRODUCING ZIRCONIA INTO TUNGSTEN POWDER AS A STEP PRIOR TO PRESSING TO COHERENT FROM AND SINTERING IN A HYDROGEN ATMOSPHERE, COMPRISING DOPING TUNGSTIC OXIDE WITH A SOLUBLE COMPOUND OF ZIRCONIUM WHICH WILL FORM ZIRCONIUM DIOXIDE ON HEATING AND IN A QUANTITY SUFFICIENT TO PRODUCE AN EXCESSIVE AMOUNT OF ZIRCONIA OVER THAT DESIRED, REDUCING SAID DOPED TUNGSTEN OXIDE TO A TUNGSTEN METAL POWDER CONTAINING ZIRCONIA,. BLENDING SAID ZIROCNIA-CONTAINING TUNGSTEN METAL POWDER WITH A LARGE PROPORTION OF ZIRCONIA-FREE TUNGSTEN METAL POWDER IN AMOUNTS SO THAT SAID BLEN CONTAINS A PROPORTION OF ZIRCONIA OF FROM 0.1% TO 1% BY WEIGHT OF TOTAL TUNGSTEN METAL POWDER.
Claim 2
Independent Claim
105 words
THE METHOD OF INTRODUCING ZIRCONIA INTO TUNGSTEN POWDER AS A STEP PRIOR TO PRESSING TO COHERENT FROM AND SINTERING IN A HYDROGEN ATMOSPHERE, COMPRISING DOPING TUNGSTIC OXIDE WITH A SOLUBLE COMPOUND OF ZIRCONIUM WHICH WILL FORM ZIRCONIUM DIOXIDE ON HEATING AND IN A QUANTITY SUFFICIENT TO PRODUCE AN EXCESSIVE AMOUNT OF ZIRCONIA OVER THAT DESIRED, REDUCING SAID DOPED TUNGSTEN OXIDE TO A TUNGSTEN METAL POWDER CONTAINING ZIRCONIA,. BLENDING SAID ZIROCNIA-CONTAINING TUNGSTEN METAL POWDER WITH A LARGE PROPORTION OF ZIRCONIA-FREE TUNGSTEN METAL POWDER IN AMOUNTS SO THAT SAID BLEN CONTAINS A PROPORTION OF ZIRCONIA OF FROM 0.1% TO 1% BY WEIGHT OF TOTAL TUNGSTEN METAL POWDER.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-07-08 | 1961-01-07 | 1961-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-07-08 | 1965-01-07 | 1965-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-07-08 | 1969-01-07 | 1969-07-09 | $7700.00 | Window Closed / Lapsed |