Patent US3269850A successfully refreshed from Google Patents.
US3269850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Alumina refractories
Assignee: —
•
Filing: —
•
Granted: 1966-08-30
•
Expires: 1983-08-30
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 08:55
CPC Classifications
C; C03; C03C; C03C3/00; C03C3/04; C03C3/062; C04; C04B; C04B35/00; C04B35/66; C04B35/01; C04B35/10; C04B35/101; C04B35/622; C04B35/626; C04B35/62605; C04B35/62645; C04B35/62665; C04B2235/00; C04B2235/02; C04B2235/30; C04B2235/32; C04B2235/3205; C04B2235/3206; C04B2235/3217; C04B2235/34; C04B2235/3418; C04B2235/50; C04B2235/54; C04B2235/5418; C04B2235/5427; C04B2235/5436; C04B2235/5463; C04B2235/5472; C04B2235/70; C04B2235/72
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
A FIRED, HIGH ALUMINA REFRACTORY BODY MADE FROM A BATCH CONSISTING ESSENTIALLY OF, BY WEIGHT FROM 1 TO 10% OF VOLATILIZED SILICA, FROM 0 TO 10% OF CRYSTALLINE SILICA, THE REMAINDER BEING HIGH ALUMINA REFACTORY MATERIAL WHICH ANALYSES AT LEAST ABOUT 50%, BY WEIGHT, AL203 ON AN OXIDE BASIS, SAID HIGH ALUMINA REFRACTORY MATERIAL INCULDING HOLLOW SPHERICAL PARTICLES OF ALUMINA, SAID SPHERICAL PARTICLES OF ALUMINA CONSTITUTING FROM 15 TO 30%, BY WEIGHT, OF THE BATCH AND SUBSTANTIALLY ALL BEING -4+65 MESH, THERE BEING A -65 MESH FRACTION INCLUDING THE VOLATILIZED SILICA, THE CRYSTALLINE SILICA, AND THE REMAINING HIGH ALUMINA MATERIAL, SAID FIRED SHAPED BEING CHARACTERIZED BY A SUBSTANTIALLY CONTINUOUS SKELETAL NETWORK OF FINE CRYSTALLINE MULLITE ENCAPSULATING SEPARATE AND DISCONTINOUS SPHERICAL VOIDS, SAID VOIDS IN NUMBER AND SIZE BEING SUBSTANTIALLY IDENTICAL TO THE SPHERICAL PARTICLES OF ALUMINA, IN THE BATCH FROM WHICH THE BODY IS MADE.
Claim 2
Dependent Claim
145 words
A FIRED, HIGH ALUMINA REFRACTORY BODY MADE FROM A BATCH CONSISTING ESSENTIALLY OF, BY WEIGHT FROM 1 TO 10% OF VOLATILIZED SILICA, FROM 0 TO 10% OF CRYSTALLINE SILICA, THE REMAINDER BEING HIGH ALUMINA REFACTORY MATERIAL WHICH ANALYSES AT LEAST ABOUT 50%, BY WEIGHT, AL203 ON AN OXIDE BASIS, SAID HIGH ALUMINA REFRACTORY MATERIAL INCULDING HOLLOW SPHERICAL PARTICLES OF ALUMINA, SAID SPHERICAL PARTICLES OF ALUMINA CONSTITUTING FROM 15 TO 30%, BY WEIGHT, OF THE BATCH AND SUBSTANTIALLY ALL BEING -4+65 MESH, THERE BEING A -65 MESH FRACTION INCLUDING THE VOLATILIZED SILICA, THE CRYSTALLINE SILICA, AND THE REMAINING HIGH ALUMINA MATERIAL, SAID FIRED SHAPED BEING CHARACTERIZED BY A SUBSTANTIALLY CONTINUOUS SKELETAL NETWORK OF FINE CRYSTALLINE MULLITE ENCAPSULATING SEPARATE AND DISCONTINOUS SPHERICAL VOIDS, SAID VOIDS IN NUMBER AND SIZE BEING SUBSTANTIALLY IDENTICAL TO THE SPHERICAL PARTICLES OF ALUMINA, IN THE BATCH FROM WHICH THE BODY IS MADE.
References Cited (Backward Citations)
US3067050A
Cited
US2965506A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-29 | 1970-02-28 | 1970-08-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-29 | 1974-02-28 | 1974-08-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-29 | 1978-02-28 | 1978-08-30 | $7700.00 | Window Closed / Lapsed |