US2873197A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory fibrous material
Assignee: Unifrax I LLC
•
Filing: 1955-01-21
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Granted: 1959-02-10
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Expires: 1975-01-21
Abstract
No abstract record available.
Inventors
- 👤 John C Mcmullen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:01
CPC Classifications
C; C03; C03C; C03C13/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
43 words
AN INORGANIC FIBER MATERIAL CONSISTING ESSENTIALLY OF 40 TO 60 PERCENT BY WEIGHT SILICA, 20 TO LESS THAN 45 PERCENT BY WEIGHT ALUMINA AND 3 1/2 TO 20 PERCENT BY WEIGHT ZIRCONIA, THE SILICA TO ALUMINA RATIO BY WEIGHT BEING AT LEAST 1.
Claim 2
Dependent Claim
43 words
AN INORGANIC FIBER MATERIAL CONSISTING ESSENTIALLY OF 40 TO 60 PERCENT BY WEIGHT SILICA, 20 TO LESS THAN 45 PERCENT BY WEIGHT ALUMINA AND 3 1/2 TO 20 PERCENT BY WEIGHT ZIRCONIA, THE SILICA TO ALUMINA RATIO BY WEIGHT BEING AT LEAST 1.
References Cited (Backward Citations)
US2557834A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-09 | 1962-08-11 | 1963-02-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-09 | 1966-08-11 | 1967-02-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-09 | 1970-08-11 | 1971-02-10 | $7700.00 | Window Closed / Lapsed |