Patent US3559623A successfully refreshed from Google Patents.
US3559623A
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Lance for blowing oxygen into a kaldo furnace
Assignee: Sollac SA
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Filing: 1969-01-21
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Granted: 1971-02-02
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Expires: 1989-01-21
Abstract
Abstract A lance for blowing oxygen into a Kaldo furnace for refining iron into steel which comprises a main oxygen duct, auxiliary oxygen duct means and a cooling circuit. The auxiliary duct means and a cooling circuit. The auxiliary duct means debouch substantially tangentially into the main oxygen duct at a point spaced from the outlet orifice of the lance by a distance which is at least four times the mean diameter of the portion of the main duct between the outlet orifice and the auxiliary oxygen duct means.
Inventors
- 👤 Georges Decamps
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:21
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
37 words
A lance as claimed in claim 1, wherein the forward section of said main duct is of a length which is from 5 to 10 times the mean diameter of the forward section of said main duct.
Claim 2
Dependent Claim
152 words
A lance for blowing oxygen into a furnace of the Kaldo-type and comprising a main duct, a plurality of auxiliary duct means and a cooling circuit, wherein the main duct comprises a rearward section which is connectable to a source of oxygen, a forward section which has an outlet orifice and is of a length which is at least 4 times its mean diameter, and a mixing chamber which is disposed between and interconnects said rearward and forward sections and which has an axial length which is at least equal to the radial width of the auxiliary duct means; wherein the plurality of auxiliary duct means comprises a plurality of ducts arranged helically about the rearward section of the main duct and debouch substantially tangentially into the mixing chamber; and wherein the cooling circuit encases the forward section and mixing chamber of said main duct and the plurality of auxiliary duct means.
Claim 3
Dependent Claim
37 words
A lance as claimed in claim 3, wherein the forward section of said main duct is of a length which is from 5 to 10 times the mean diameter of the forward section of said main duct.
Claim 4
Dependent Claim
49 words
A lance as claimed in claim 3, wherein the plurality of auxiliary ducts are defined by a duct which is coaxial with said main duct and forms with said main duct an annular passageway which debouches into said mixing chamber and by a screw-threaded sleeve disposed in said passageway.
Claim 5
Dependent Claim
55 words
A lance as claimed in claim 3, wherein the plurality of auxiliary ducts are disposed in an annular passageway which is defined by said main duct and a duct which is coaxial with said main duct, and wherein the mixing chamber has a diameter equal to that of said duct coaxial with said main duct.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-02-01 | 1974-08-03 | 1975-02-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-01 | 1978-08-03 | 1979-02-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-01 | 1982-08-03 | 1983-02-02 | $7700.00 | Window Closed / Lapsed |