Patent US3727897A successfully refreshed from Google Patents.
US3727897A
Expired / Lapsed
US
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Lance with distance measuring sub-system
Assignee: Avco Corp
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Filing: 1971-02-17
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Granted: 1973-04-17
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Expires: 1991-02-17
Abstract
Abstract The invention is directed to an assembly which includes in combination a lance for supplying a gas to a nozzle in combination with radar-type means for determining the distance between the nozzle and a reflecting surface spaced from the nozzle. In the preferred embodiment, the assembly comprises an oxygen lance for a basic oxygen furnace which includes means for determining the distance between the lance and the surface of the charge in the furnace.
Inventors
- 👤 R Bennett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 16:19
CPC Classifications
C; C21; C21C; C21C5/00; C21C5/28; C21C5/42; C21C5/46; C21C5/4606
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
90 words
A lance assembly with an electromagnetic wave sub-assembly for measuring the spacing of the lance in relation to a reflecting surface of a materials processing charge comprising: a fluid carrying lance terminating in at least one nozzle having a nozzle opening; transmitter and receiver means located in the lance proximate said nozzle opening; coupling means for carrying signals to and from said nozzle from said transmitter and receiver, said nozzle and nozzle opening acting as an antenna; and signal generating and signal processing means coupled to said transmitter and receiver.
Claim 2
Dependent Claim
90 words
A lance assembly with an electromagnetic wave sub-assembly for measuring the spacing of the lance in relation to a reflecting surface of a materials processing charge comprising: a fluid carrying lance terminating in at least one nozzle having a nozzle opening; transmitter and receiver means located in the lance proximate said nozzle opening; coupling means for carrying signals to and from said nozzle from said transmitter and receiver, said nozzle and nozzle opening acting as an antenna; and signal generating and signal processing means coupled to said transmitter and receiver.
Claim 3
Dependent Claim
50 words
A lance assembly as defined in claim 1 in which the distance from said transmitter and receiver to the nozzle opening is D1 and the distance from said nozzle opening to the reflecting surface is in the range of D2 to D2 + D3, where D1 is smaller than D2.
Claim 4
Dependent Claim
40 words
A lance assembly as defined in claim 1 in which lance is an oxygen lance for a basic oxygen furnace, said transmitter and receiver are located in the oxygen supply pipe, and said antenna is an otherwise conventional oxygen nozzle.
Claim 5
Dependent Claim
27 words
A lance assembly as defined in claim 3 in which said coupling overlies the nozzle and includes means for providing unimpeded oxygen flow to said antenna-oxygen nozzle.
Claim 6
Dependent Claim
25 words
A lance assembly as defined in claim 4 in which said coupling includes a perforated cylinder interconnecting the oxygen supply pipe and said antenna-oxygen nozzle.
Claim 7
Dependent Claim
15 words
A lance as defined in claim 4 in which said transmitter modulation index is 200-500.
References Cited (Backward Citations)
FR1434231A
Cited
US3701518A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-04-16 | 1976-10-16 | 1977-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-16 | 1980-10-16 | 1981-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-16 | 1984-10-16 | 1985-04-17 | $7700.00 | Window Closed / Lapsed |