Patent US3308514A successfully refreshed from Google Patents.
US3308514A
Expired / Lapsed
US
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Method of hot topping using vermicular graphite
Assignee: Dow Chemical Co
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Filing: 1965-01-07
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Granted: 1967-03-14
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Expires: 1985-01-07
Abstract
No abstract record available.
Inventors
- 👤 Osborn Oliver
- 👤 Jackson Lake
- 👤 Olstowski Franciszek
- 👤 Horvath Jack Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 17:51
CPC Classifications
B; B22; B22D; B22D7/00; B22D7/06; B22D7/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
71 words
IN A METHOD OF HOT-TOPPIN A MOLTEN METAL BY COVERING SAID MOLTEN METAL WITH A REFRACTORY, PARTICULATE MATERIAL, THE IMPROVEMENT WHICH COMPRISES: COVERING THE EXPOSED SURFACE OF SAID MOLTEN METAL WITH A LAYER OF AN ACID-TREATED PARTICULATE GRAPHITE, SAID METAL BEING AT A MINIMUM TEMPERATURE OF ABOUT 150*C. AND SAID GRAPHITE BEING FURTHER CHARACTERIZED AS ONE WHICH EXPANDS INTO VERMICULAR PARTICLES UPON BEING HEATED AT A MINIMUM TEMPERATURE OF ABOUT 150*C.
Claim 2
Dependent Claim
71 words
IN A METHOD OF HOT-TOPPIN A MOLTEN METAL BY COVERING SAID MOLTEN METAL WITH A REFRACTORY, PARTICULATE MATERIAL, THE IMPROVEMENT WHICH COMPRISES: COVERING THE EXPOSED SURFACE OF SAID MOLTEN METAL WITH A LAYER OF AN ACID-TREATED PARTICULATE GRAPHITE, SAID METAL BEING AT A MINIMUM TEMPERATURE OF ABOUT 150*C. AND SAID GRAPHITE BEING FURTHER CHARACTERIZED AS ONE WHICH EXPANDS INTO VERMICULAR PARTICLES UPON BEING HEATED AT A MINIMUM TEMPERATURE OF ABOUT 150*C.
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) | 1970-03-13 | 1970-09-12 | 1971-03-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-03-13 | 1974-09-12 | 1975-03-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-03-13 | 1978-09-12 | 1979-03-14 | $7700.00 | Window Closed / Lapsed |