US3247000A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory bodies and method of making same
Assignee: Unifrax I LLC
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Filing: 1961-10-16
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Granted: 1966-04-19
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Expires: 1981-10-16
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:57
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/645; C04B35/01; C04B35/10; C04B35/101; C04B35/106; Y; Y10; Y10T; Y10T407/00; Y10T407/27
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
64 words
A SINTERED REFRACTORY BODY HAVING HIGH STRENGTH AND HIGH RESISTANCE TO THERMAL SHOCK, SAID BODY CONSISTING ESSENTIALY OF FROM 70 PERCENT TO 85 PERCENT BY WEIGHT OF ALUMINA AND FROM 30 PERCENT TO 15 PERCENT BY WEIGHT OF UNSTABILIZED ZIRCONIA, SAID BODY HAVING A PORSITY OF BETWEEN 3 AND 13 PERCENT AND HAVING A MODULUS OF RUPTURE WHICH IS INCREASED FOLLOWING THERMAL SHOCK TREATMENT.
Claim 2
Dependent Claim
64 words
A SINTERED REFRACTORY BODY HAVING HIGH STRENGTH AND HIGH RESISTANCE TO THERMAL SHOCK, SAID BODY CONSISTING ESSENTIALY OF FROM 70 PERCENT TO 85 PERCENT BY WEIGHT OF ALUMINA AND FROM 30 PERCENT TO 15 PERCENT BY WEIGHT OF UNSTABILIZED ZIRCONIA, SAID BODY HAVING A PORSITY OF BETWEEN 3 AND 13 PERCENT AND HAVING A MODULUS OF RUPTURE WHICH IS INCREASED FOLLOWING THERMAL SHOCK TREATMENT.
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) | 1969-04-18 | 1969-10-18 | 1970-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-04-18 | 1973-10-18 | 1974-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-04-18 | 1977-10-18 | 1978-04-19 | $7700.00 | Window Closed / Lapsed |