Patent US3850811A successfully refreshed from Google Patents.
US3850811A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic filter
Assignee: US Philips Corp
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Filing: 1974-02-01
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Granted: 1974-11-26
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Expires: 1994-02-01
Abstract
Abstract A magnetic pipeline filter having a plurality of filtering grids each consisting of a row of spaced parallel strips of magnetizable material, the rows extending in the direction of flow of the fluid being filtered, in which the strips of each grip form a zigzag pattern so that the ferromagnetic particles trapped in the gaps between the strips during the operation of the filter are more readily flushed from these gaps during backflushing of the filter.
Inventors
- 👤 B Wheelock
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 20:20
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/025; B03C1/031; B03C1/033; B03C1/034; B01; B01D; B01D35/00; B01D35/06
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
222 words
A magnetic filter for trapping and removing ferromagnetic contaminates from a fluid flowed selectively upstream and downstream through said filter, comprising a housing defining a fluid duct therethrough, the duct having a central axis with upstream and downstream ends thereof, a filtering grid situated in said duct and formed of a plurality of magnetizable strips comprising a first row of strips, each strip having an axis which is oblique to said duct axis, said strips forming a zigzag path with each strip having an upstream and a downstream end corresponding to said duct ends, and the upstream end of each strip having a side part thereof, the downstream end of each strip is adjacent and spaced from the side part of the upstream end of a strip that is downstream therefrom with a gap defined between said adjacent ends, the filter further comprising at least one additional row of strips similar to the first row and parallel thereto defining a fluid passage between said two rows, and means for selectively magnetizing and de-magnetizing said strips, whereby said ferromagnetic contaminants will be entrapped in said gaps when said fluid flows in a downstream direction while the strips are magnetized, and said trapped contaminants are flushed out of the filter when said fluid is flowed in an upstream direction while said strips are de-magnetized.
Claim 2
Dependent Claim
222 words
A magnetic filter for trapping and removing ferromagnetic contaminates from a fluid flowed selectively upstream and downstream through said filter, comprising a housing defining a fluid duct therethrough, the duct having a central axis with upstream and downstream ends thereof, a filtering grid situated in said duct and formed of a plurality of magnetizable strips comprising a first row of strips, each strip having an axis which is oblique to said duct axis, said strips forming a zigzag path with each strip having an upstream and a downstream end corresponding to said duct ends, and the upstream end of each strip having a side part thereof, the downstream end of each strip is adjacent and spaced from the side part of the upstream end of a strip that is downstream therefrom with a gap defined between said adjacent ends, the filter further comprising at least one additional row of strips similar to the first row and parallel thereto defining a fluid passage between said two rows, and means for selectively magnetizing and de-magnetizing said strips, whereby said ferromagnetic contaminants will be entrapped in said gaps when said fluid flows in a downstream direction while the strips are magnetized, and said trapped contaminants are flushed out of the filter when said fluid is flowed in an upstream direction while said strips are de-magnetized.
Claim 3
Dependent Claim
28 words
A filter according to claim 1 comprising additional rows of strips parallel to said first two rows, thereby forming a plurality of zigzag fluid passages between said rows.
Claim 4
Dependent Claim
14 words
A filter according to claim 1 wherein each row comprises at least three strips.
Claim 5
Dependent Claim
25 words
A filter according to claim 1 further comprising a grating at the upstream end thereof for screening large contaminants from flowing through said filtering grid.
Claim 6
Dependent Claim
34 words
Apparatus according to claim 1, wherein said means for magnetizing and de-magnetizing said strips comprises an electromagnetic coil which is carried by said housing, and which surrounds the fluid duct and filtering grid therein.
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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) | 1977-11-25 | 1978-05-27 | 1978-11-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-25 | 1982-05-27 | 1982-11-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-25 | 1986-05-27 | 1986-11-26 | $7700.00 | Window Closed / Lapsed |