US2688562A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnesia and carbon refractory and its preparation
Assignee: Illinois Clay Products Co
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Filing: 1952-10-21
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Granted: 1954-09-07
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Expires: 1972-10-21
Abstract
No abstract record available.
Inventors
- 👤 Howard F West
- 👤 John H Veale
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 16:05
CPC Classifications
C; C04; C04B; C04B28/00; C04B28/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A BASIC REFRACTORY CONSISTING ESSENTIALLY OF 50 TO 70 PERCENT BY WEIGHT OF DEAD OF BURNED MAGNESIA, 10 TO 30 PERCENT BY WEIGHT OF CARBON GRANULES, AND 10 TO 25 PERCENT BY WEIGHT OF FIRE CLAY, SAID MAGNESIA, FIRE CLAY AND CARBON BEING INTIMATELY MIXED AND BONDED TOGETHER BY THE PRODUCT OF THE REACTION OF A PORTION OF THE MAGNESIA WITH SULPHURIC ACID.
Claim 2
Dependent Claim
63 words
A BASIC REFRACTORY CONSISTING ESSENTIALLY OF 50 TO 70 PERCENT BY WEIGHT OF DEAD OF BURNED MAGNESIA, 10 TO 30 PERCENT BY WEIGHT OF CARBON GRANULES, AND 10 TO 25 PERCENT BY WEIGHT OF FIRE CLAY, SAID MAGNESIA, FIRE CLAY AND CARBON BEING INTIMATELY MIXED AND BONDED TOGETHER BY THE PRODUCT OF THE REACTION OF A PORTION OF THE MAGNESIA WITH SULPHURIC ACID.
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) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |