US3284218A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High alumina refractories
Assignee: Harbison Walker Refractories Co
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Filing: 1965-01-14
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Granted: 1966-11-08
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Expires: 1985-01-14
Abstract
No abstract record available.
Inventors
- 👤 Donald F King
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:45
CPC Classifications
C; C04; C04B; C04B33/00; C04B33/02; C04B33/13; C04B33/1315; C04B35/00; C04B35/01; C04B35/013; C04B35/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
70 words
A PHOSPHATE-BOUNDED HIGH ALUMINA REFRACTORY COMPOSITION CONSISTING ESSENTIALLY OF A REFRACTORY SIZE-GRADED MIXTURE OF HIGH ALUMINA REFRACTORY MATERIAL, ABOUT 1-10% OF SAID MATERIAL BEING AL(OH)3, BY WEIGHT OF PHOSPHATEBONDING INGREDIENT SUFFICIENT TO PROVIDE P205 EQUIVALENT TO THAT PROVIDED BY ABOUT 2-15% OF 75% PHOSPHORIC ACID AND OXALIC ACID IN AN AMOUNT SUFFICIENT TO INCREASE STORAGE LIFE BY RETARDING BREAKDOWN OF THE PHOSPHATE BOND THEREBY ASSURING GREATER STRENGTH IN EVENTUAL SERVICE.
Claim 2
Dependent Claim
70 words
A PHOSPHATE-BOUNDED HIGH ALUMINA REFRACTORY COMPOSITION CONSISTING ESSENTIALLY OF A REFRACTORY SIZE-GRADED MIXTURE OF HIGH ALUMINA REFRACTORY MATERIAL, ABOUT 1-10% OF SAID MATERIAL BEING AL(OH)3, BY WEIGHT OF PHOSPHATEBONDING INGREDIENT SUFFICIENT TO PROVIDE P205 EQUIVALENT TO THAT PROVIDED BY ABOUT 2-15% OF 75% PHOSPHORIC ACID AND OXALIC ACID IN AN AMOUNT SUFFICIENT TO INCREASE STORAGE LIFE BY RETARDING BREAKDOWN OF THE PHOSPHATE BOND THEREBY ASSURING GREATER STRENGTH IN EVENTUAL SERVICE.
References Cited (Backward Citations)
US2220411A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-11-07 | 1970-05-09 | 1970-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-11-07 | 1974-05-09 | 1974-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-11-07 | 1978-05-09 | 1978-11-08 | $7700.00 | Window Closed / Lapsed |