US3725040A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of operating a variable flame oxy-fuel burner
Assignee: Air Products and Chemicals Inc
•
Filing: 1970-07-23
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Granted: 1973-04-03
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Expires: 1990-07-23
Abstract
Abstract AN OXY-FUEL BURNER FOR USE IN A METALLURGICAL FURNACE IS DISCLOSED WHICH CAN BE CONTROLLED TO REGULATE THE CONFIGURATION OF THE BURNER FLAME TO PROVIDE A FLAME SHAPE VARYING FROM A WIDE "UMBRELLA" SHAPED FLAME TO A NARROW "PENCIL" SHAPED FLAME. SEVERAL METHODS OF USING SUCH BURNERS IN METALLURGICAL FURNACES ARE ALSO CISCLOSED.
Inventors
- 👤 R Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 05:23
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/30; C21C5/32
Claims Analysis
Total Claims: 0
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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) | 1976-04-02 | 1976-10-02 | 1977-04-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-02 | 1980-10-02 | 1981-04-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-02 | 1984-10-02 | 1985-04-03 | $7700.00 | Window Closed / Lapsed |