US3180744A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Refractory
Assignee: Harbison Walker Refractories Co
•
Filing: 1962-07-27
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Granted: 1965-04-27
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Expires: 1982-07-27
Abstract
No abstract record available.
Inventors
- 👤 Davies Ben
- 👤 Frank H Walther
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 18:53
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/42; C04B35/12; C04B35/44
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
78 words
A BURNED REFRACTORY SHAPE CONSISTING OF REFRACTORY BRICKMAKING SIZE GRADED MAGNESIA AND CHROME ORE IN A WEIGHT RATIO BETWEEN ABOUT 80/20 AND 60/40, AT LEAST A MAJOR PORTION OF THE CHROME ORE PASSING A 28 MESH SCREEN AND RESTING ON A 65 MESH SCREEN, THERE BEING MORE -65 MESH MAGNESIA THAN -65 MESH CHROME ORE, SAID SHAPE BEING BURNED ABOVE ABOUT 3000*F. AND HAVING A MODULUS OF RUPTURE AT 2300*F. AT LEAST SUBSTANTIALALY TWICE THAT AT ROOM TEMPERATURE.
Claim 2
Dependent Claim
78 words
A BURNED REFRACTORY SHAPE CONSISTING OF REFRACTORY BRICKMAKING SIZE GRADED MAGNESIA AND CHROME ORE IN A WEIGHT RATIO BETWEEN ABOUT 80/20 AND 60/40, AT LEAST A MAJOR PORTION OF THE CHROME ORE PASSING A 28 MESH SCREEN AND RESTING ON A 65 MESH SCREEN, THERE BEING MORE -65 MESH MAGNESIA THAN -65 MESH CHROME ORE, SAID SHAPE BEING BURNED ABOVE ABOUT 3000*F. AND HAVING A MODULUS OF RUPTURE AT 2300*F. AT LEAST SUBSTANTIALALY TWICE THAT AT ROOM TEMPERATURE.
References Cited (Backward Citations)
US2079066A
Cited
US2639993A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-04-26 | 1968-10-26 | 1969-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-04-26 | 1972-10-26 | 1973-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-04-26 | 1976-10-26 | 1977-04-27 | $7700.00 | Window Closed / Lapsed |