US2966406A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of tungsten from tungsten oxides
Assignee: US Philips Corp
•
Filing: 1958-06-06
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Granted: 1960-12-27
•
Expires: 1978-06-06
Abstract
No abstract record available.
Inventors
- 👤 Spier Henri Louis
- 👤 Wanmaker Willem Lambertus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 04:44
CPC Classifications
C; C22; C22B; C22B34/00; C22B34/30; C22B34/36
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
73 words
THE METHOD OF PRODUCING TUNGSTEN POWDER COMPRISING THE STEP, MIXING 100 GRAMS OF A SILICO FREE TUNGSTEN, COMPOUND SELECTED FROM THE GROUP CONSISTING OF TUNGSTIC ACID AND THE TUNGSTATES WITH ABOUT 4-4.5 G. OF A POTASSIUM SILICO TUNGSTATE, THE ANHYDROUS FORM OF WHICH CORRESPONDS TO THE FORMULA K4SIW12O46. AND A SMALLER AMOUNT OF ALUMINUM NITRATE AND HEATING SAID RESULTANT MIXTURE IN A HYDROGEN ATMOSPHERE AT A TEMPERATURE OF FROM ABOUT 500*C. TO 900*C.
Claim 2
Independent Claim
73 words
THE METHOD OF PRODUCING TUNGSTEN POWDER COMPRISING THE STEP, MIXING 100 GRAMS OF A SILICO FREE TUNGSTEN, COMPOUND SELECTED FROM THE GROUP CONSISTING OF TUNGSTIC ACID AND THE TUNGSTATES WITH ABOUT 4-4.5 G. OF A POTASSIUM SILICO TUNGSTATE, THE ANHYDROUS FORM OF WHICH CORRESPONDS TO THE FORMULA K4SIW12O46. AND A SMALLER AMOUNT OF ALUMINUM NITRATE AND HEATING SAID RESULTANT MIXTURE IN A HYDROGEN ATMOSPHERE AT A TEMPERATURE OF FROM ABOUT 500*C. TO 900*C.
References Cited (Backward Citations)
US1558000A
Cited
US2077873A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-12-27 | 1964-06-27 | 1964-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-12-27 | 1968-06-27 | 1968-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-12-27 | 1972-06-27 | 1972-12-27 | $7700.00 | Window Closed / Lapsed |