US2599236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of silica brick from highly siliceous sands
Assignee: Dr C Otto and Co GmbH
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Filing: 1950-04-26
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Granted: 1952-06-03
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Expires: 1970-04-26
Abstract
No abstract record available.
Inventors
- 👤 Cramer Friedrich Wilhelm
- 👤 Saffran Otto Wilhelm Franz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 11:25
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
61 words
THE METHOD OF MANUFACTURING SILICA REFRACTORIES OF HIGHLY SILICEOUS PARTICLES IN WHICH SAID MATERIAL IS PREBAKED AND IN WHICH THE PARTICLES PREBAKED ARE KEPT IN MOTION DURING THE PREBAKING OPERATION AND IN WHICH THE PREBAKED MATERIAL IS THEREAFTER MOLDED INTO REFRACTORIES AND IN WHICH SAID REFRACTORIES ARE FIRED AT TEMPERATURES IN THE RANGE OF ABOUT 1350* C. TO ABOUT 1400* C.
Claim 2
Independent Claim
61 words
THE METHOD OF MANUFACTURING SILICA REFRACTORIES OF HIGHLY SILICEOUS PARTICLES IN WHICH SAID MATERIAL IS PREBAKED AND IN WHICH THE PARTICLES PREBAKED ARE KEPT IN MOTION DURING THE PREBAKING OPERATION AND IN WHICH THE PREBAKED MATERIAL IS THEREAFTER MOLDED INTO REFRACTORIES AND IN WHICH SAID REFRACTORIES ARE FIRED AT TEMPERATURES IN THE RANGE OF ABOUT 1350* C. TO ABOUT 1400* 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) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |