US3451803A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of removing carbon from mixtures of tungsten powder and thoria and insuring a uniform dispersion of thoria
Assignee: Philips North America LLC
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Filing: 1966-11-10
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Granted: 1969-06-24
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Expires: 1986-11-10
Abstract
No abstract record available.
Inventors
- 👤 Nicholas F Cerulli
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:21
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/10; C22C1/1026; Y; Y10; Y10S; Y10S75/00; Y10S75/956
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
167 words
THE METHOD OF REMOVING CARBON FROM A MIXTURE OF TUNGSTEN POWDER AND THORIA WHILE SIMULTANEOUSLY INSURING A UNIFORM DISPERSION OF SAID THORIA IN SAID TUNGSTEN POWDER, WHEREIN THE CARBON IN SAID MIXTURE IS PRESENT EITHER AS AN IMPURITY, OR AS AN ADDITIVE, OR AS BOTH AN IMPURITY AND AN ADDITIVE, IN SUCH AMOUNT THAT THE TOTAL GRAM-MOLES OF THORIA IN SAID MIXTURE ARE AT LEAST AND PREFERABLY MORE THAN ONE-THIRD OF THE TOTAL GRAM-ATOMS OF CARBON IN SAID MIXTURE, WHICH METHOD COMPRISES: (A) HEATING SAID MIXTURE IN AN INERT ATMOSPHERE OR A VACUUM AT A PREDETERMINED TEMPERATURE FOR A SUFFICIENT TIME TO REACT ALL OF SAID CARBON IN SAID MIXTURE WITH THORIA IN SAID MIXTURE TO FORM THORIUM CARBIDE; (B) COOING SAID REACTED MIXTURE; (C) EXPOSING SAID COOLED MIXTURE TO MOISTURE FOR A SUFFICIENT TIME TO HYDROLYZE ALL OF THE FORMED THORIUM CARBIDE; AND (D) HEATING SAID HYDROLYZED MIXTURE UNDER NON-REACTIVE CONDITIONS AT A TEMPERATURE OF AT LEAST 100*C. FOR A SUFFICIENT TIME TO VOLATILIZE RESIDUAL WATER.
Claim 2
Independent Claim
167 words
THE METHOD OF REMOVING CARBON FROM A MIXTURE OF TUNGSTEN POWDER AND THORIA WHILE SIMULTANEOUSLY INSURING A UNIFORM DISPERSION OF SAID THORIA IN SAID TUNGSTEN POWDER, WHEREIN THE CARBON IN SAID MIXTURE IS PRESENT EITHER AS AN IMPURITY, OR AS AN ADDITIVE, OR AS BOTH AN IMPURITY AND AN ADDITIVE, IN SUCH AMOUNT THAT THE TOTAL GRAM-MOLES OF THORIA IN SAID MIXTURE ARE AT LEAST AND PREFERABLY MORE THAN ONE-THIRD OF THE TOTAL GRAM-ATOMS OF CARBON IN SAID MIXTURE, WHICH METHOD COMPRISES: (A) HEATING SAID MIXTURE IN AN INERT ATMOSPHERE OR A VACUUM AT A PREDETERMINED TEMPERATURE FOR A SUFFICIENT TIME TO REACT ALL OF SAID CARBON IN SAID MIXTURE WITH THORIA IN SAID MIXTURE TO FORM THORIUM CARBIDE; (B) COOING SAID REACTED MIXTURE; (C) EXPOSING SAID COOLED MIXTURE TO MOISTURE FOR A SUFFICIENT TIME TO HYDROLYZE ALL OF THE FORMED THORIUM CARBIDE; AND (D) HEATING SAID HYDROLYZED MIXTURE UNDER NON-REACTIVE CONDITIONS AT A TEMPERATURE OF AT LEAST 100*C. FOR A SUFFICIENT TIME TO VOLATILIZE RESIDUAL WATER.
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) | 1972-06-23 | 1972-12-23 | 1973-06-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-23 | 1976-12-23 | 1977-06-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-23 | 1980-12-23 | 1981-06-24 | $7700.00 | Window Closed / Lapsed |