US4354856A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for recovering magnetic particles
Assignee: Chevron USA Inc
•
Filing: 1981-01-26
•
Granted: 1982-10-19
•
Expires: 2001-01-26
Abstract
Abstract A method and apparatus for recovering magnetic particles from a fluid stream is provided. The fluid is contacted with a ferromagnetic element to cause attraction and collection of the particles. The ferromagnetic element is then heated to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles. The collected magnetic particles are then disengaged from the ferromagnetic element. Preferably the ferromagnetic element is disposed in an applied magnetic field and the heating is preferred by passing alternating electric current through the element thereby causing sufficient vibration to disengage the particles.
Inventors
- 👤 Robert T. Lewis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:26
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/002; C; C10; C10G; C10G32/00; C10G32/02
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
68 words
A method for recovering magnetic paticles from a fluid comprising (a) contacting said fluid with a ferromagnetic element to cause the attraction and collection of magnetic particles from said fluid; (b) heating said ferromagnetic element to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles; and (c) disengaging collected magnetic particles from said ferromagnetic element.
Claim 2
Independent Claim
68 words
A method for recovering magnetic paticles from a fluid comprising (a) contacting said fluid with a ferromagnetic element to cause the attraction and collection of magnetic particles from said fluid; (b) heating said ferromagnetic element to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles; and (c) disengaging collected magnetic particles from said ferromagnetic element.
Claim 3
Dependent Claim
19 words
The method of claim 1 wherein said ferromagnetic element is heated by passing electric current through said ferromagnetic element.
Claim 4
Dependent Claim
16 words
The method of claim 1 wherein said collected particles are disengaged by vibrating said ferromagnetic element.
Claim 5
Dependent Claim
16 words
The method of claim 1 wherein said ferromagnetic element is disposed within an applied magnetic field.
Claim 6
Dependent Claim
47 words
The method of claim 1 wherein said ferromagnetic element is disposed within an applied magnetic field and said ferromagnetic element is heated by passing alternating electric current through said ferromagnetic element to cause sufficient vibration of said ferromagnetic element to release collected particles from said ferromagnetic element.
Claim 7
Dependent Claim
17 words
The method of claim 1 wherein said fluid comprises retorted shale oil containing oil shale mineral solids.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said fluid stream comprises flue gas from an oil shale combustor said flue gas containing oil shale mineral solids.
Claim 9
Independent Claim
74 words
An apparatus for recovering magnetic particles from a fluid stream comprising (a) a ferromagnetic element disposed within a pathway for said fluid stream for attracting and collecting magnetic particles from said fluid stream (b) means for heating said ferromagnetic element to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles (c) means for releasing collected particles from said heated ferromagnetic element.
Claim 10
Independent Claim
74 words
An apparatus for recovering magnetic particles from a fluid stream comprising (a) a ferromagnetic element disposed within a pathway for said fluid stream for attracting and collecting magnetic particles from said fluid stream (b) means for heating said ferromagnetic element to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles (c) means for releasing collected particles from said heated ferromagnetic element.
Claim 11
Dependent Claim
24 words
The apparatus of claim 8 wherein said means for heating the ferromagnetic element is a means for passing electric current through said ferromagnetic element.
Claim 12
Dependent Claim
20 words
The apparatus of claim 8 wherein said means for releasing collected particles is a means for vibrating said ferromagnetic element.
Claim 13
Dependent Claim
16 words
The apparatus of claim 8 wherein said ferromagnetic element is disposed within an applied magnetic field.
Claim 14
Dependent Claim
52 words
The apparatus of claim 8 wherein said ferromagnetic element is disposed within an applied magnetic field and said means for heating the ferromagnetic element is a means for passing alternating electric current through said ferromagnetic element to cause sufficient vibration of said ferromagnetic element to release collected particles from said ferromagnetic element.
Claim 15
Independent Claim
71 words
A method for recovering magnetic particles from a gaseous fluid comprising (a) contacting said gaseous fluid with a ferromagnetic element to cause the attraction and collection of magnetic particles from said gaseous fluid; (b) heating said ferromagnetic element to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles; and (c) disengaging collected magnetic particles from said ferromagnetic element.
Claim 16
Independent Claim
71 words
A method for recovering magnetic particles from a gaseous fluid comprising (a) contacting said gaseous fluid with a ferromagnetic element to cause the attraction and collection of magnetic particles from said gaseous fluid; (b) heating said ferromagnetic element to a temperature near or above the Curie temperature of at least one of (1) the ferromagnetic element and (2) collected magnetic particles; and (c) disengaging collected magnetic particles from said ferromagnetic element.
Claim 17
Dependent Claim
19 words
The method of claim 13 wherein said ferromagnetic element is heated by passing electric current through said ferromagnetic element.
Claim 18
Dependent Claim
16 words
The method of claim 13 wherein said collected particles are disengaged by vibrating said ferromagnetic element.
Claim 19
Dependent Claim
16 words
The method of claim 13 wherein said ferromagnetic element is disposed within an applied magnetic field.
Claim 20
Dependent Claim
47 words
The method of claim 13 wherein said ferromagnetic element is disposed within an applied magnetic field and said ferromagnetic element is heated by passing alternating electric current through said ferromagnetic element to cause sufficient vibration of said ferromagnetic element to release collected particles from said ferromagnetic element.
Claim 21
Dependent Claim
19 words
The method of claim 13 wherein said gaseous fluid stream comprises retorted shale oil containing oil shale mineral solids.
References Cited (Backward Citations)
GB190017461A
Cited
US987156A
Cited
US1286247A
Cited
US2678130A
Cited
US2807363A
Cited
US3507026A
Cited
SU467755A1
Cited
US3838773A
Cited
US3873448A
Cited
US4116829A
Cited
SU532394A1
Cited
US4119500A
Cited
US4100491A
Cited
JPS5447901A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-10-18 | 1986-04-19 | 1986-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-10-18 | 1990-04-19 | 1990-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-10-18 | 1994-04-19 | 1994-10-19 | $7700.00 | Window Closed / Lapsed |