Patent US2994394A successfully refreshed from Google Patents.
Patent US3869390A successfully refreshed from Google Patents.
US3869390A
Expired / Lapsed
US
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Electromagnetic filter
Assignee: Kraftwerk Union AG
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Filing: 1972-12-22
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Granted: 1975-03-04
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Expires: 1992-12-22
Abstract
Abstract An electromagnetic filter for removing iron oxide from the feed water of boilers in steam power plants includes a filter bed of metal balls disposed within a vessel and an excitation coil located about the vessel in the ova of the filter bed. The excitation coil has passages for passing a cooling medium and a jacket disposed about the excitation coil has inlet openings and outlet openings for the cooling medium. The arrangement being such that the jacket serves to facilitate passage of the cooling medium while providing a magnetic yoke for improving the magnetization of the metal balls.
Inventors
- 👤 Hans-Gunther Heitmann
- 👤 Gerhard Donath
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:02
CPC Classifications
C; C02; C02F; C02F1/00; C02F1/48; B; B01; B01D; B01D35/00; B01D35/06; B01D35/18; B03; B03C; B03C1/00; B03C1/02; B03C1/025; B03C1/031; B03C1/033; B03C1/0335; B03C2201/00; B03C2201/18
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
143 words
ELECTROMAGNETIC FILTER FOR REMOVING IRON OXIDES FROM THE FEED WATER OF BOILERS IN STEAM POWER PLANTS OF THE TYPE HAVING A CYLINDRICAL FILTER VESSEL, A FILTER BED OF HARD-MAGNETIC STEEL BALLS AND BEING ENCLOSED BY AN EXCITATION COIL HAVING PASSAGES FOR THE PASSAGE OF COOLANTS, WHEREIN THE FIELD INTENSITY PRODUCED BY SAID EXCITATION COIL IS CONSIDERABLY ABOVE THE SATURATION FIELD INTENSITY OF THE STEEL BALLS; A MAGNETIC YOKE COMPRISING A PROTECTIVE STEEL JACKET SURROUNDING THE COIL, THE WALL THICKNESS OF SAID JACKET BEING PROPORTIONED IN THE VICINITY OF THE EXCITATION COIL, SO AS TO SERVE AS A MAGNETIC YOKE, THE BALL FILLING OF THE FILTER BED AND THE THICKENED PART OF THE PROTEC TIVE JACKET EXTENDING UPWARDLY AND DOWNWARDLY BEYOND THE EXCITATION COIL, AND AN ANNULAR BODY PROVIDED WITH RECESSES LOCATED BELOW THE EXCITATION COIL AND THE FILTER VESSEL FOR THE SUPPORT THEREOF.
Claim 2
Dependent Claim
143 words
ELECTROMAGNETIC FILTER FOR REMOVING IRON OXIDES FROM THE FEED WATER OF BOILERS IN STEAM POWER PLANTS OF THE TYPE HAVING A CYLINDRICAL FILTER VESSEL, A FILTER BED OF HARD-MAGNETIC STEEL BALLS AND BEING ENCLOSED BY AN EXCITATION COIL HAVING PASSAGES FOR THE PASSAGE OF COOLANTS, WHEREIN THE FIELD INTENSITY PRODUCED BY SAID EXCITATION COIL IS CONSIDERABLY ABOVE THE SATURATION FIELD INTENSITY OF THE STEEL BALLS; A MAGNETIC YOKE COMPRISING A PROTECTIVE STEEL JACKET SURROUNDING THE COIL, THE WALL THICKNESS OF SAID JACKET BEING PROPORTIONED IN THE VICINITY OF THE EXCITATION COIL, SO AS TO SERVE AS A MAGNETIC YOKE, THE BALL FILLING OF THE FILTER BED AND THE THICKENED PART OF THE PROTEC TIVE JACKET EXTENDING UPWARDLY AND DOWNWARDLY BEYOND THE EXCITATION COIL, AND AN ANNULAR BODY PROVIDED WITH RECESSES LOCATED BELOW THE EXCITATION COIL AND THE FILTER VESSEL FOR THE SUPPORT THEREOF.
Claim 3
Dependent Claim
19 words
Filter according to claim 1, wherein the protective jacket is constructed as a perforated sheet having a sieve meshing.
Claim 4
Dependent Claim
23 words
Filter as claimed in claim 1, wherein the protective jacket is covered, at least on the upper end thereof, with a perforated sheet.
References Cited (Backward Citations)
US3059910A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-03 | 1978-09-02 | 1979-03-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-03 | 1982-09-02 | 1983-03-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-03 | 1986-09-02 | 1987-03-04 | $7700.00 | Window Closed / Lapsed |