Patent US4593974A successfully refreshed from Google Patents.
Patent US2599185A successfully refreshed from Google Patents.
US2599185A
Expired / Lapsed
US
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Refractory body
Assignee: Battelle Development Corp
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Filing: 1950-04-25
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Granted: 1952-06-03
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Expires: 1970-04-25
Abstract
No abstract record available.
Inventors
- 👤 Jack M Lepp
- 👤 John A Slyh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 16:12
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/622; C04B35/64; C04B35/65
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
A CERAMIC REFRACTORY MATERIAL HAVING GOOD THERMAL SHOCK RESISTANCE AND A MODULUS OF RUPTURE IN THE RANGE 800 TO 12,400 LBS./IN.2, SAID MATERIAL CONSISTING OF A MOLDED MIXTURE SINTERED IN GRAPHITE IN AN OXIDIZING ATMOSPHERE AND COMPRISING 35 TO 90% ALUMINA AND 10 TO 65% ALUMINUM PRIOR TO SINTERING, AND SHOWING ALUMINUM, ALUMINA, ALUMINUM NITRIDE, AND CARBON ON X-RAY ANALYSIS SUBSEQUENT TO SINTERING.
Claim 2
Dependent Claim
63 words
A CERAMIC REFRACTORY MATERIAL HAVING GOOD THERMAL SHOCK RESISTANCE AND A MODULUS OF RUPTURE IN THE RANGE 800 TO 12,400 LBS./IN.2, SAID MATERIAL CONSISTING OF A MOLDED MIXTURE SINTERED IN GRAPHITE IN AN OXIDIZING ATMOSPHERE AND COMPRISING 35 TO 90% ALUMINA AND 10 TO 65% ALUMINUM PRIOR TO SINTERING, AND SHOWING ALUMINUM, ALUMINA, ALUMINUM NITRIDE, AND CARBON ON X-RAY ANALYSIS SUBSEQUENT TO SINTERING.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-06-03 | 1955-12-03 | 1956-06-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-06-03 | 1959-12-03 | 1960-06-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-06-03 | 1963-12-03 | 1964-06-03 | $7700.00 | Window Closed / Lapsed |