Patent US2613153A successfully refreshed from Google Patents.
US2613153A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory insulating brick and method of manufacture
Assignee: Johns Manville Corp
•
Filing: 1949-05-17
•
Granted: 1952-10-07
•
Expires: 1969-05-17
Abstract
No abstract record available.
Inventors
- 👤 William L Stafford
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:47
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/063; C04B38/0635
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
69 words
A LIGHT WEIGHT REFRACTORY INSULATING BRICK HAVING A DENSITY OF 60-67 LBS/CU. FT. AND SUBSTANTIAL VOLUMETRIC STABILITY UP TO 3000* F. CONSISTING ESSENTIALLY OF AL2O3 AND SIO2 IN THE WEIGHT RATIO OF ABOUT 2:1 AND HAVING A HIGH CONTENT OF CRYSTALLINE MULLITE, SAID BRICK BEING AN UNVITRIFIED OXIDIZED AND FIRED REACTION PRODUCT OF A UNIFORMLY DISTRIBUTED MIXTURE COMPRISING WATER, FINELY DICIDED KAOLIN CLAY, ALUMINA, COMBUSTIBLE MATERIAL AND METALLIC ALUMINUM.
Claim 2
Dependent Claim
69 words
A LIGHT WEIGHT REFRACTORY INSULATING BRICK HAVING A DENSITY OF 60-67 LBS/CU. FT. AND SUBSTANTIAL VOLUMETRIC STABILITY UP TO 3000* F. CONSISTING ESSENTIALLY OF AL2O3 AND SIO2 IN THE WEIGHT RATIO OF ABOUT 2:1 AND HAVING A HIGH CONTENT OF CRYSTALLINE MULLITE, SAID BRICK BEING AN UNVITRIFIED OXIDIZED AND FIRED REACTION PRODUCT OF A UNIFORMLY DISTRIBUTED MIXTURE COMPRISING WATER, FINELY DICIDED KAOLIN CLAY, ALUMINA, COMBUSTIBLE MATERIAL AND METALLIC ALUMINUM.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-10-07 | 1956-04-07 | 1956-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-10-07 | 1960-04-07 | 1960-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-10-07 | 1964-04-07 | 1964-10-07 | $7700.00 | Window Closed / Lapsed |