Patent US3753183A successfully refreshed from Google Patents.
US3753183A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming a magnetized helical coil
Assignee: Vickers Inc
•
Filing: 1972-06-21
•
Granted: 1973-08-14
•
Expires: 1992-06-21
Abstract
Abstract A filter including a cylindrical filter element which is arranged to normally have fluid pass therethrough. A bypass valve is provided to bypass fluid directly to the outlet when the pressure at the inlet becomes excessive. A magnetized helical coil is provided adjacent the filter element to attract metal particles.
Inventors
- 👤 R Aspinwall
- 👤 K Mackellar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:35
CPC Classifications
H; H01; H01F; H01F13/00; H01F13/003; B; B01; B01D; B01D35/00; B01D35/06; B01D35/14; B01D35/143; B01D35/147
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
157 words
The method of forming a magnetized helical coil of wire which has a plurality of alternating north and south poles along its entire length which comprises placing a helical coil having a plurality of convolutions on a core with adjacent convolutions of said helical coil spaced from one another, engaging a first pole of a DC coil with the exposed radial sides of the convolutions of said helical coil at a first set of longitudinally spaced points along the length of the helical coil, engaging a second pole of said DC coil with the exposed radial sides of the convolutions of said helical coil at a second set of longitudinally spaced points along the length of said helical coil, applying a force to said first and second poles to clamp said convolutions of said helical coil between said core and each of said poles, and applying a DC voltage across said poles to produce a magnetic field.
Claim 2
Independent Claim
157 words
The method of forming a magnetized helical coil of wire which has a plurality of alternating north and south poles along its entire length which comprises placing a helical coil having a plurality of convolutions on a core with adjacent convolutions of said helical coil spaced from one another, engaging a first pole of a DC coil with the exposed radial sides of the convolutions of said helical coil at a first set of longitudinally spaced points along the length of the helical coil, engaging a second pole of said DC coil with the exposed radial sides of the convolutions of said helical coil at a second set of longitudinally spaced points along the length of said helical coil, applying a force to said first and second poles to clamp said convolutions of said helical coil between said core and each of said poles, and applying a DC voltage across said poles to produce a magnetic field.
Claim 3
Dependent Claim
27 words
The method set forth in claim 1 wherein said first and second sets of points each comprises at least one row extending axially of said helical coil.
Claim 4
Dependent Claim
29 words
The method set forth in claim 1 wherein said first and second sets of points each comprise at least two circumferentially spaced rows extending axially of said helical coil.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-08-13 | 1977-02-12 | 1977-08-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-13 | 1981-02-12 | 1981-08-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-13 | 1985-02-12 | 1985-08-14 | $7700.00 | Window Closed / Lapsed |