US3179723A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming metal carbide spheroids with carbon coat
Assignee: Individual
•
Filing: 1962-06-12
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Granted: 1965-04-20
•
Expires: 1982-06-12
Abstract
No abstract record available.
Inventors
- 👤 Walter V Goeddel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:23
CPC Classifications
C; C04; C04B; C04B41/00; C04B41/009; B; B01; B01J; B01J2/00; B01J2/006; C01; C01B; C01B32/00; C01B32/90; C04B41/45; C04B41/4584; C04B41/80; C04B41/81; C23; C23C; C23C16/00; C23C16/22; C23C16/26; G; G21; G21C; G21C3/00; G21C3/42; G21C3/58; G21C3/62; G21C3/626; G21C7/00; G21C7/02; G21C7/04; C01P; C01P2004/00; C01P2004/30; C01P2004/32; C01P2004/80; Y; Y02; Y02E; Y02E30/00; Y02E30/30; Y10; Y10S; Y10S376/00; Y10S376/90; Y10S376/901; Y10S376/903
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
157 words
A METHOD OF FABRICATING A METAL CARBIDE PARTICLE WHICH COMPRISES MIXING TOGETHER A CARBIDE-FORMING MATERIAL CONTAINING THE METAL OF THE CARBIDE TO BE FORMED, CARBONIZABLE BINDER AND CARBON SUFFICIENT TO YIELD A SOLUTION OF CARBON IN THE RESULTANT CARBIDE IN EXCESS OF THE SATURATION CONCENTRATION AT ELEVATED TEMPERATURES, CONVERTING SAID MIXTURE INTO PARTICLES AND DISPOSING SAID PARTICLES IN A BED OF FINELY DIVIDED GAPHITE, HEATING SAID PARTICLES IN SAID BED TO ABOVE THE CARBURIZING TEMPERATURE OF SAID PARTICLES, AND SUBSEQUENTLY HEATING SAID PARTICLES IN SAID BED TO ABOVE THE MELTING POINT THEREOF SO AS TO SPHEROIDIZE THE SAME, COOLING SAID PARTICLES TO BELOW THE MELTING POINT THEREOF, SEPARATING SAID PARTICLES FROM SAID GRAPHITE BED AND HEATING SAID PARTICLES IN A GASEOUS HYDROCARBON ATMOSPHERE TO ABOVE THE PYROLYTIC DECOMPOSITION TEMPERATURE FOR SAID HYDROCARBON TO FORM A PROTECTIVE ADHERENT OUTER COATING OF PYROLYTIC CARBON ABOUT SAID PARTICLE, WHEREBY AN IMPROVED METAL CARBIDE PARTICLE HAVING INCREASED THERMAL STABILITY IS FORMED.
Claim 2
Independent Claim
157 words
A METHOD OF FABRICATING A METAL CARBIDE PARTICLE WHICH COMPRISES MIXING TOGETHER A CARBIDE-FORMING MATERIAL CONTAINING THE METAL OF THE CARBIDE TO BE FORMED, CARBONIZABLE BINDER AND CARBON SUFFICIENT TO YIELD A SOLUTION OF CARBON IN THE RESULTANT CARBIDE IN EXCESS OF THE SATURATION CONCENTRATION AT ELEVATED TEMPERATURES, CONVERTING SAID MIXTURE INTO PARTICLES AND DISPOSING SAID PARTICLES IN A BED OF FINELY DIVIDED GAPHITE, HEATING SAID PARTICLES IN SAID BED TO ABOVE THE CARBURIZING TEMPERATURE OF SAID PARTICLES, AND SUBSEQUENTLY HEATING SAID PARTICLES IN SAID BED TO ABOVE THE MELTING POINT THEREOF SO AS TO SPHEROIDIZE THE SAME, COOLING SAID PARTICLES TO BELOW THE MELTING POINT THEREOF, SEPARATING SAID PARTICLES FROM SAID GRAPHITE BED AND HEATING SAID PARTICLES IN A GASEOUS HYDROCARBON ATMOSPHERE TO ABOVE THE PYROLYTIC DECOMPOSITION TEMPERATURE FOR SAID HYDROCARBON TO FORM A PROTECTIVE ADHERENT OUTER COATING OF PYROLYTIC CARBON ABOUT SAID PARTICLE, WHEREBY AN IMPROVED METAL CARBIDE PARTICLE HAVING INCREASED THERMAL STABILITY IS FORMED.
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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) | 1968-04-19 | 1968-10-19 | 1969-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-19 | 1972-10-19 | 1973-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-19 | 1976-10-19 | 1977-04-20 | $7700.00 | Window Closed / Lapsed |