US2678887A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydration resistant calcium oxide refractories
Assignee: NL Industries Inc
•
Filing: 1951-12-10
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Granted: 1954-05-18
•
Expires: 1971-12-10
Abstract
No abstract record available.
Inventors
- 👤 Augustus J Hathaway
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/03
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
36 words
A FIRED REFRACTORY BODY HAVING HIGH RESISTANCE OF HYDRATION AND A COMPOSITION OF FROM 50 TO 98 MOL PER CENT CAO, 1 TO 25 MOL PER CENT TIO2, AND 1 TO 25 MOL PER CENT ZRO2.
Claim 2
Dependent Claim
36 words
A FIRED REFRACTORY BODY HAVING HIGH RESISTANCE OF HYDRATION AND A COMPOSITION OF FROM 50 TO 98 MOL PER CENT CAO, 1 TO 25 MOL PER CENT TIO2, AND 1 TO 25 MOL PER CENT ZRO2.
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) | 1957-05-17 | 1957-11-16 | 1958-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-17 | 1961-11-16 | 1962-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-17 | 1965-11-16 | 1966-05-18 | $7700.00 | Window Closed / Lapsed |