Patent EP0752808A1 successfully refreshed from Google Patents.
US2852401A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Unshaped high temperature refractory
Assignee: Harbison Walker Refractories Co
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Filing: 1955-06-13
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Granted: 1958-09-16
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Expires: 1975-06-13
Abstract
No abstract record available.
Inventors
- 👤 Kenneth W Hansen
- 👤 Donald F King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 23:14
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A HIGH TEMPERATURE REFRACTORY COMPOSITION COMPOSED OF UNCONSOLIDATED PARTICLES SUBSTANTIALLY DRY TO THE TOUCH AND CONSISTING ESSENTIALLY OF, BY WEIGHT, A MIXTURE OF AT LEAST ABOUT 65 PERCENT OF INERT REFRACTORY AGGREGATE AND THE REMAINDER AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDRATED ALUMINA, RAW BAUXITE, RAW DIASPORE AND RAW CLAYS, SAID MIXTURE BEING PRETREATED WITH CONCENTRATED PHOSPHORIC ACID IN AN AMOUNT TO PROVIDE P2O5 EQUIVALENT TO THAT PROVIDED BY ABOUT 2 TO 15 PERCENT BY WEIGHT OF 75 PERCENT PHOSPHORIC ACID, AND THEN DRIED AT A TEMPERATURE NOT OVER ABOUT 125*F., AND WHICH AFTER TEMPERING TO PLASTIC CONDITION WITH WATER AND BEING MOLDED DEVELOPS AIR SET AND MECHANICAL STRENGTH WHICH, UPON HEATING, RAPIDLY BECOMES HIGH AND IS CONTINUOUSLY MAINTAINED HIGH WHEN SUBJECTED TO ELEVATED TEMPERATURES.
Claim 2
Dependent Claim
129 words
A HIGH TEMPERATURE REFRACTORY COMPOSITION COMPOSED OF UNCONSOLIDATED PARTICLES SUBSTANTIALLY DRY TO THE TOUCH AND CONSISTING ESSENTIALLY OF, BY WEIGHT, A MIXTURE OF AT LEAST ABOUT 65 PERCENT OF INERT REFRACTORY AGGREGATE AND THE REMAINDER AT LEAST ONE MEMBER SELECTED FROM THE GROUP CONSISTING OF HYDRATED ALUMINA, RAW BAUXITE, RAW DIASPORE AND RAW CLAYS, SAID MIXTURE BEING PRETREATED WITH CONCENTRATED PHOSPHORIC ACID IN AN AMOUNT TO PROVIDE P2O5 EQUIVALENT TO THAT PROVIDED BY ABOUT 2 TO 15 PERCENT BY WEIGHT OF 75 PERCENT PHOSPHORIC ACID, AND THEN DRIED AT A TEMPERATURE NOT OVER ABOUT 125*F., AND WHICH AFTER TEMPERING TO PLASTIC CONDITION WITH WATER AND BEING MOLDED DEVELOPS AIR SET AND MECHANICAL STRENGTH WHICH, UPON HEATING, RAPIDLY BECOMES HIGH AND IS CONTINUOUSLY MAINTAINED HIGH WHEN SUBJECTED TO ELEVATED TEMPERATURES.
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) | 1961-09-15 | 1962-03-17 | 1962-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-15 | 1966-03-17 | 1966-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-15 | 1970-03-17 | 1970-09-16 | $7700.00 | Window Closed / Lapsed |