US3067050A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina refractories
Assignee: —
•
Filing: —
•
Granted: 1962-12-04
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Expires: 1979-12-04
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:34
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/16; C04B35/18; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B35/66; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/327; C04B2235/3272; C04B2235/34; C04B2235/3418; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/5436; C04B2235/5463; C04B2235/5472; C04B2235/70; C04B2235/74; C04B2235/77
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
147 words
A FIRED HIGH ALUMINA REFRACTORY BODY PREPARED FORM A MIX CONSISTING ESSENTIALLY OF, BY WEIGHT, FROM AT LEAST 1 PERCENT TO NOT OVER 10 PERCENT OF SUBSTANTIALLY PURE VOLATILIZED SILICA, AND THE REMAINDER OF A COARSE GROUND ALUMINA REFRACTORY MATERIAL, HAVING LESS THAN ABOUT 1.3 PERCENT, BY WEIGHT, OF IRON OXIDE, AND SELECTED FROM THE GROUP CONSISTING OF ALUMINA, ALUMINUM ORES AND MIXTURES THEREOF CONTAINING AT LEAST ABOUT 50 PERCENT OF AL2O3, BY ANYLYSIS, WHEREBY THE MIX CONTAINS AT LEAST ABOUT 50 PERCENT OF AL2O3 BY ANALYSIS SUPPLIED BY SAID REFRACTORY MATERIAL, SAID SILICA BEING SUBSTANTIALLY ALL IN THE FORM OF A FINE CRYSTALLINE MULLITE BINDING BETWEEN THE PARTICLES OF REFRACTORY MATERIAL AND IN WHICH SAID MULLITE APPEARS IN THE FORM OF A MASS OF SUB-MICRON SIZE CRYSTALS HAVING VERY SMALL AND HIGHLY DISPERED VOIDS WHEREBY A COARSE TEXTURED YET DENSE AND HIGHLY IMPERMEABLE BODY IS OBTAINED.
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) | 1965-12-03 | 1966-06-04 | 1966-12-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-12-03 | 1970-06-04 | 1970-12-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-12-03 | 1974-06-04 | 1974-12-04 | $7700.00 | Window Closed / Lapsed |