Patent US5217703A successfully refreshed from Google Patents.
US5217703A
Expired / Lapsed
US
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Method of manufacture of iron oxide particles
Assignee: RTX Corp
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Filing: 1991-08-28
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Granted: 1993-06-08
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Expires: 2011-08-28
Abstract
Abstract The present invention discloses a novel injector for the introduction of iron-containing vapor into a stream of heated oxidized gas wherein the injector has a least two passageways, one for the passage of the iron compound containing vapor and the other for the passage of an insulating gas.
Inventors
- 👤 Forrest R. Goodson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 19:04
CPC Classifications
B; B01; B01J; B01J19/00; B01J19/26; B01J12/00; B01J12/02; C; C01; C01G; C01G49/00; C01G49/02; B01J2219/00; B01J2219/00049; B01J2219/00051; B01J2219/00074; B01J2219/00087; B01J2219/00094; B01J2219/00119; B01J2219/0015
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
172 words
A method for manufacturing iron oxide particles comprising; a. introducing a stream of vaporized iron containing compound through a first passageway of an injector into a heated stream of oxidizing reaction gas in a reaction chamber and thereby causing the iron containing compound to spontaneously oxidize to iron oxide particles; b. simultaneously passing an unheated gas through a second passageway of the injector into said reaction chamber wherein said second passageway is positioned parallel to and coaxially about the first passageway c. removing the iron oxide particles from the heated oxidizing stream by electrostatic precipitation; d. removing the iron oxide particles from the electrostatic precipitator by turning off the flow of vaporized iron containing compound for a period of time while substantially continuing the flow of heated oxidizing gas and unheated gas wherein the flow of unheated gas is sufficient to maintain the temperature of the injector below that of the pyrolysis temperature of the iron containing compound during the period that the vaporized iron oxide is not flowing through the injector.
Claim 2
Independent Claim
172 words
A method for manufacturing iron oxide particles comprising; a. introducing a stream of vaporized iron containing compound through a first passageway of an injector into a heated stream of oxidizing reaction gas in a reaction chamber and thereby causing the iron containing compound to spontaneously oxidize to iron oxide particles; b. simultaneously passing an unheated gas through a second passageway of the injector into said reaction chamber wherein said second passageway is positioned parallel to and coaxially about the first passageway c. removing the iron oxide particles from the heated oxidizing stream by electrostatic precipitation; d. removing the iron oxide particles from the electrostatic precipitator by turning off the flow of vaporized iron containing compound for a period of time while substantially continuing the flow of heated oxidizing gas and unheated gas wherein the flow of unheated gas is sufficient to maintain the temperature of the injector below that of the pyrolysis temperature of the iron containing compound during the period that the vaporized iron oxide is not flowing through the injector.
Claim 3
Dependent Claim
33 words
The method of claim 1 wherein the outlet for said second passageway is tapered to provide streamline flow of the heated oxidizing gas and avoid recirculation at or near the first outlet port.
Claim 4
Dependent Claim
12 words
The method of claim 1 wherein the iron-containing compound is iron pentacarbonyl.
Claim 5
Dependent Claim
22 words
The method of claim 1 wherein the iron-containing compound is a carbonyl, chelate of a beta diketone, complex cyanide or ferrocene compound.
Claim 6
Dependent Claim
28 words
The method of claim 1 wherein the unheated gas is a gas capable of oxidizing the iron-containing compound when said gas is heated to a substantially higher temperature.
Claim 7
Dependent Claim
11 words
The method of claim 1 wherein the unheated gas is air.
Claim 8
Dependent Claim
20 words
The method of claim 1 wherein the unheated gas is a gas which is unable to oxidize the iron-containing compound.
Claim 9
Dependent Claim
40 words
The method of claim 1 wherein the flow of gas discharging from the outlet of the second passageway creates a subambient pressure about the outlet of the first passageway thereby preventing an influx of oxidizing gas into the first passageway.
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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) | 1996-06-07 | 1996-12-07 | 1997-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-06-07 | 2000-12-07 | 2001-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-06-07 | 2004-12-07 | 2005-06-08 | $7700.00 | Window Closed / Lapsed |