US2579886A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of making pebble-shaped magnesia refractory
Assignee: Kaiser Aluminum and Chemical Corp
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Filing: 1948-10-07
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Granted: 1951-12-25
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Expires: 1968-10-07
Abstract
No abstract record available.
Inventors
- 👤 Arthur W Vettel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:01
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03; C04B35/04; C04B35/053
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
PROCESS OF MAKING PEBBLE-SHAPED MAGNESIA REFRACTORY COMPRISING CALCINING MAGNESIA-YIELDING MATERIAL, CONTAINING ON THE IGNITED BASIS AT LEAST 95% MAGNESIUM OXIDE AND NOT OVER 1.5% SILICA, TO AN IGNITION LOSS OF NOT OVER ABOUT 0.75%, NODULIZING SAID CALCINED MATERIAL WHILE SPRAYING WITH A LIQUID BINDER, AT LEAST ABOUT 90% OF SAID CALCINED MATERIAL PASSING THROUGH A 100 MESH SCREEN, AND FIRING SAID NODULES AT A TEMPERATURE OF AT LEAST 1800* C.
Claim 2
Dependent Claim
70 words
PROCESS OF MAKING PEBBLE-SHAPED MAGNESIA REFRACTORY COMPRISING CALCINING MAGNESIA-YIELDING MATERIAL, CONTAINING ON THE IGNITED BASIS AT LEAST 95% MAGNESIUM OXIDE AND NOT OVER 1.5% SILICA, TO AN IGNITION LOSS OF NOT OVER ABOUT 0.75%, NODULIZING SAID CALCINED MATERIAL WHILE SPRAYING WITH A LIQUID BINDER, AT LEAST ABOUT 90% OF SAID CALCINED MATERIAL PASSING THROUGH A 100 MESH SCREEN, AND FIRING SAID NODULES AT A TEMPERATURE OF AT LEAST 1800* 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) | 1954-12-24 | 1955-06-25 | 1955-12-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-12-24 | 1959-06-25 | 1959-12-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-12-24 | 1963-06-25 | 1963-12-25 | $7700.00 | Window Closed / Lapsed |