US3976286A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Metallurgical lances
Assignee: Gr Stein Refractories Ltd
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Filing: 1974-08-19
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Granted: 1976-08-24
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Expires: 1994-08-19
Abstract
Abstract A lance for injecting fluid materials into molten metal comprising a length of metal tube having anchors secured to the outer surface of the tube and projecting from the tube, the anchors being spaced in the longitudinal and circumferential directions, and supplementary anchors suitably secured to the tube between the first anchors, there being applied over a major portion of the length of the tube a refractory coating, which refractory coating is held to the tube by the first anchors and the supplementary anchors.
Inventors
- 👤 Peter Thompson
- 👤 John Richardson Taylor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:27
CPC Classifications
C; C21; C21C; C21C7/00; C21C7/0037; C21C1/00; C21C1/02; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606; C21C5/4613; Y; Y10; Y10T; Y10T428/00; Y10T428/12; Y10T428/12201; Y10T428/12333; Y10T428/12444
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
131 words
A lance for injecting fluidized particulate material into molten metal, comprising a metal tube having first anchor means secured to the outer surface of the tube and projecting outwardly from the tube, said first anchor means being secured to the tube at least adjacent the ends of the tube and spaced circumferentially around the tube, and supplementary anchor means formed of wire secured to the tube and extending substantially between said first anchor means, a plurality of barbs spaced along said wire projecting outwardly from said tube, a refractory coating applied over a major portion of the length of the tube and covering said first and supplementary anchor means, whereby the refractory coating is held to the tube by the said first anchor means and by said wire and said barbs.
Claim 2
Dependent Claim
131 words
A lance for injecting fluidized particulate material into molten metal, comprising a metal tube having first anchor means secured to the outer surface of the tube and projecting outwardly from the tube, said first anchor means being secured to the tube at least adjacent the ends of the tube and spaced circumferentially around the tube, and supplementary anchor means formed of wire secured to the tube and extending substantially between said first anchor means, a plurality of barbs spaced along said wire projecting outwardly from said tube, a refractory coating applied over a major portion of the length of the tube and covering said first and supplementary anchor means, whereby the refractory coating is held to the tube by the said first anchor means and by said wire and said barbs.
Claim 3
Dependent Claim
35 words
A lance as in claim 1, wherein a diamond shaped network grid of supplementary anchor means is formed by the wire and barbs helically wound around the circumference and along the length of the tube.
Claim 4
Dependent Claim
19 words
A lance as in claim 1, wherein the refractory coating on the tube comprises a chemically bonded alumina refractory.
Claim 5
Dependent Claim
19 words
A lance as in claim 1, wherein the refractory coating on the tube comprises a chemically bonded magnesite refractory.
Claim 6
Dependent Claim
14 words
A lance as in claim 3, wherein the chemical bond comprises a phosphate bond.
Claim 7
Dependent Claim
12 words
A lance as in claim 4, wherein the bond comprises calcium polyphosphate.
References Cited (Backward Citations)
GB801519A
Cited
US3071458A
Cited
US3352552A
Cited
US3430940A
Cited
US3839057A
Cited
US3833209A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-24 | 1980-02-23 | 1980-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-24 | 1984-02-23 | 1984-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-24 | 1988-02-23 | 1988-08-24 | $7700.00 | Window Closed / Lapsed |