Patent US3371917A successfully refreshed from Google Patents.
US3371917A
Expired / Lapsed
US
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Apparatus for feeding fuel into a blast furnace
Assignee: Buell Engineering Co Inc
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Filing: 1965-10-21
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Granted: 1968-03-05
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Expires: 1985-10-21
Abstract
No abstract record available.
Inventors
- 👤 Lauritz E Mylting
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 17:57
CPC Classifications
C; C21; C21B; C21B5/00; C21B5/001; C21B5/003
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
APPARATUS FOR FEEDING SOLID FUEL INTO A BLAST FURNACE COMPRISING MEANS INCLUDING FEED PIPES ENTERING EACH OF THE TUYERES FOR CONTINUOUSLY DISCHARGING GAS STREAMS UNDER PRESSURE INTO THE FURNACE THROUGH TUYERS, MEANS FOR VARYING THE PRESSURE OF THE GAS STREAM IN THE FEED PIPE TO EACH TUYERS IN ACCORDANCE WITH THE PRESSURE IN THE FURNACE ADJACENT TO THAT TUYERS TO MAINTAIN A SUBSTANTIAL-
Claim 2
Dependent Claim
63 words
APPARATUS FOR FEEDING SOLID FUEL INTO A BLAST FURNACE COMPRISING MEANS INCLUDING FEED PIPES ENTERING EACH OF THE TUYERES FOR CONTINUOUSLY DISCHARGING GAS STREAMS UNDER PRESSURE INTO THE FURNACE THROUGH TUYERS, MEANS FOR VARYING THE PRESSURE OF THE GAS STREAM IN THE FEED PIPE TO EACH TUYERS IN ACCORDANCE WITH THE PRESSURE IN THE FURNACE ADJACENT TO THAT TUYERS TO MAINTAIN A SUBSTANTIAL-
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-03-05 | 1971-09-04 | 1972-03-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-05 | 1975-09-04 | 1976-03-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-05 | 1979-09-04 | 1980-03-05 | $7700.00 | Window Closed / Lapsed |