US2674539A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature refractory products
Assignee: Babcock and Wilcox Co
•
Filing: 1949-01-29
•
Granted: 1954-04-06
•
Expires: 1969-01-29
Abstract
No abstract record available.
Inventors
- 👤 Harter Isaac
- 👤 Charles L Norton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:50
CPC Classifications
C; C03; C03C; C03C13/00; C03C13/06; Y; Y10; Y10S; Y10S264/00; Y10S264/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
50 words
AS A NEW PRODUCT, MINERAL WOOL CONSISTING OF FIBERS OF A FLAME-MELTED ALUMINA-SILICA REFRACTORY MATERIAL AHVING AN ALKALI CONTENT LESS THAN 0.75% AND BEING WHITE IN COLOR AND FREE FROM CARBON CONSTITUENTS, SAID MATERIAL HAVING A MELTING TEMPERATURE IN THE RANGE 2900-3350 F. AND A RECRYSTALLIZATION TEMPERATURE ABOVE 2500 F.
Claim 2
Dependent Claim
50 words
AS A NEW PRODUCT, MINERAL WOOL CONSISTING OF FIBERS OF A FLAME-MELTED ALUMINA-SILICA REFRACTORY MATERIAL AHVING AN ALKALI CONTENT LESS THAN 0.75% AND BEING WHITE IN COLOR AND FREE FROM CARBON CONSTITUENTS, SAID MATERIAL HAVING A MELTING TEMPERATURE IN THE RANGE 2900-3350 F. AND A RECRYSTALLIZATION TEMPERATURE ABOVE 2500 F.
References Cited (Backward Citations)
GB165052A
Cited
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Cited
US1741920A
Cited
US1786482A
Cited
US2017056A
Cited
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Cited
GB495654A
Cited
US2467889A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-04-05 | 1957-10-05 | 1958-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-04-05 | 1961-10-05 | 1962-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-04-05 | 1965-10-05 | 1966-04-06 | $7700.00 | Window Closed / Lapsed |