US2881048A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for the production of magnesite which is poor in silica or silica-free
Assignee: Didier Werke AG
•
Filing: 1954-10-29
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Granted: 1959-04-07
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Expires: 1974-10-29
Abstract
No abstract record available.
Inventors
- 👤 Bieneck Edmund
- 👤 Schroth Erich
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:02
CPC Classifications
C; C04; C04B; C04B2/00; C04B2/10; C04B2/102
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
47 words
A PROCESS WHICH COMPRISES HEATING PARTICLES OF COMMINUTED QUARTZ-CONTAINING CRUDE MAGNESITE SUBSTANTIALLY INSTANTANEOUSLY FROM ROOM TEMPERATURE TO A TEMPERATURE OF AT LEAST 575*C., WHEREBY EXPLOSIVE SEPARATION OF SAID PARTICLES OCCURS TOGETHER WITH EXPLOSIVE DISINTEGRATION OF THE QUARTZ, AND FORTHWITH REMOVING THE RESULTANT QUARTZ POWDER FROM THE MAGNESITE.
Claim 2
Dependent Claim
47 words
A PROCESS WHICH COMPRISES HEATING PARTICLES OF COMMINUTED QUARTZ-CONTAINING CRUDE MAGNESITE SUBSTANTIALLY INSTANTANEOUSLY FROM ROOM TEMPERATURE TO A TEMPERATURE OF AT LEAST 575*C., WHEREBY EXPLOSIVE SEPARATION OF SAID PARTICLES OCCURS TOGETHER WITH EXPLOSIVE DISINTEGRATION OF THE QUARTZ, AND FORTHWITH REMOVING THE RESULTANT QUARTZ POWDER FROM THE MAGNESITE.
References Cited (Backward Citations)
US1311645A
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US2414980A
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US734240A
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US1679857A
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US1947952A
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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) | 1962-04-06 | 1962-10-06 | 1963-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-04-06 | 1966-10-06 | 1967-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-04-06 | 1970-10-06 | 1971-04-07 | $7700.00 | Window Closed / Lapsed |