US3296002A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory shapes
Assignee: EIDP Inc
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Filing: 1963-07-11
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Granted: 1967-01-03
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Expires: 1983-07-11
Abstract
No abstract record available.
Inventors
- 👤 Hare Weston Andrew
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 14:39
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/515; C04B35/56; C04B35/565; C04B35/622; C04B35/64; C04B35/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
171 words
A METHOD FOR MAKING AN IMPROVED REFRACTORY PRODUCT COMPRISING MIXING FROM ABOUT 10-50% BY WEIGHT OF PARTICLES OF THE GROUP CONSISTING OF ALUMINUM AND ALLOYS THEREOF CONTAINING A MAJOR AMOUNT OF ALUMINUM, SAID PARTICLES PASSING THROUGH AN 80-MESH SCREEN, WITH FROM ABOUT 50-90% BY WEIGHT OF REFRACTORY PARTICLES AT LEAST HALF OF WHICH PASS THROUGH A 140-MESH SCREEN, SAID PARTICLES BEING SELECTED FROM THE GROUP CONSISTING OF THE CARBIDES OF ALUMINUM, BORON, SILICON, TITANIUM, AND TUNGSTEN, THE NITRIDES OF ALUMINUM, BORON, TITANIUM, URANIUM AND SILICON, AND THE BORIDES OF CHROMIUM, MOLYBDENUM, TITANIUM, TUNGSTEN AND SILICON, FORMING THE PARTICLES INTO A BODY HAVING A POROSITY OF AT LEAST 20% AFTER REMOVAL OF VOLATILE MATERIAL, AND FIRING THE BODY IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE BETWEEN 600*C. AND THE MELTING POINT OF THE REFRACTORY FOR A PERIOD OF TIME SUFFICIENT TO OXIDIZE AT LEAST 90% OF THE ALUMINUM, THE RATE OF HEATING BEING CONTROLLED SO THAT THE TEMPERATURE OF THE SHAPED MIXTURE DOES NOT EXCEED THE AMBIENT TEMPERATURE BY MORE THAN 100*C.
Claim 2
Independent Claim
171 words
A METHOD FOR MAKING AN IMPROVED REFRACTORY PRODUCT COMPRISING MIXING FROM ABOUT 10-50% BY WEIGHT OF PARTICLES OF THE GROUP CONSISTING OF ALUMINUM AND ALLOYS THEREOF CONTAINING A MAJOR AMOUNT OF ALUMINUM, SAID PARTICLES PASSING THROUGH AN 80-MESH SCREEN, WITH FROM ABOUT 50-90% BY WEIGHT OF REFRACTORY PARTICLES AT LEAST HALF OF WHICH PASS THROUGH A 140-MESH SCREEN, SAID PARTICLES BEING SELECTED FROM THE GROUP CONSISTING OF THE CARBIDES OF ALUMINUM, BORON, SILICON, TITANIUM, AND TUNGSTEN, THE NITRIDES OF ALUMINUM, BORON, TITANIUM, URANIUM AND SILICON, AND THE BORIDES OF CHROMIUM, MOLYBDENUM, TITANIUM, TUNGSTEN AND SILICON, FORMING THE PARTICLES INTO A BODY HAVING A POROSITY OF AT LEAST 20% AFTER REMOVAL OF VOLATILE MATERIAL, AND FIRING THE BODY IN AN OXIDIZING ATMOSPHERE AT A TEMPERATURE BETWEEN 600*C. AND THE MELTING POINT OF THE REFRACTORY FOR A PERIOD OF TIME SUFFICIENT TO OXIDIZE AT LEAST 90% OF THE ALUMINUM, THE RATE OF HEATING BEING CONTROLLED SO THAT THE TEMPERATURE OF THE SHAPED MIXTURE DOES NOT EXCEED THE AMBIENT TEMPERATURE BY MORE THAN 100*C.
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) | 1970-01-02 | 1970-07-04 | 1971-01-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-02 | 1974-07-04 | 1975-01-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-02 | 1978-07-04 | 1979-01-03 | $7700.00 | Window Closed / Lapsed |