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US3837495A Expired / Lapsed US ⏱️ 0.0 years remaining

Liquid filters

Assignee: Baldwin Filters Inc
•
Filing: 1972-01-27
•
Granted: 1974-09-24
•
Expires: 1992-01-27
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Abstract

Abstract A liquid (engine-lubricating oil) filter comprising a closedended can-type housing, one end closure having oil inlet openings and a centrally disposed oil outlet opening; and a filter element or cartridge mounted in coaxial relation within the housing and including an outer cylindrical screen closed top-and-bottom by end caps, an inner, smaller-diameter cylindrical screen (center tube) disposed coaxially within the outer cylindrical screen and disposed therewithin so that it terminates well short of the upper end cap of said outer cylindrical screen, a part-flow section filling the annular space between said center tube and said outer cylindrical screen for the full axial length of said center tube, said part-flow section comprising a form-sustaining winding of cotton filtering material, and a full-flow section substantially completely filling the cylindrical space within said outer cylinderical screen above said part-flow section, said full-flow section comprising a self-contained, form-sustaining disc provided by superimposed layers of non-absorbent rayon viscose filaments which been subjected to a crimping treatment and thereupon texturized and said layers being secured together in face engagement by means, such as needling, which does not substantially impede oil flowing axially through the layer interface, said full-flow section resting directly on and being supported substantially completely by said part-flow section.

Inventors

  • 👤 J Baldwin

Bibliographic Details

Application Number —
Jurisdiction US
Data Source google_patents
Last Synchronized 2026-10-28 21:26
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/02; B01D27/10; B01D27/103; B01D27/106; B01D27/14; B01D27/142; B01D27/144; B01D2201/00; B01D2201/18; B01D2201/188

Claims Analysis

Total Claims: 5
Claim 1
Independent Claim 232 words
A liquid filter comprising: a closed-ended, generally cylindrical housing, the relatively lower end closure thereof having at least one inlet opening to and a central outlet passage from the interior space of said housing; and a generally cylindrical filter cartridge mounted coaxially within said housing and in the path of oil flow between said inlet opening and said outlet passage, said filter cartridge including an outer cylindrical screen extending the full axial length of the cartridge, end caps affixed to the ends of said screen and a perforated wall center tube having substantially lesser axial length than said outer cylindrical screen and being assembled therein with its relatively lower end in communication with said outlet passage and with its upper end terminating well short of the upper end cap and in substantially full oPen communication with the cylindrical space within said outer cylindrical screen extending above said center tube, a part-flow form-sustaining section completely filling the annular space between said outer cylindrical screen and said center tube, said section consisting of a ''''rope'''' of assorted cotton threads wound to annular configuration, and a full-flow section comprising a full-circular preform substantially completely filling said cylindrical space within said outer screen extending above said center tube and providing radial inward and axial paths of flow to the center tube, said full-flow section resting directly on and being supported substantially completely by said part-flow section.
Claim 2
Dependent Claim 232 words
A liquid filter comprising: a closed-ended, generally cylindrical housing, the relatively lower end closure thereof having at least one inlet opening to and a central outlet passage from the interior space of said housing; and a generally cylindrical filter cartridge mounted coaxially within said housing and in the path of oil flow between said inlet opening and said outlet passage, said filter cartridge including an outer cylindrical screen extending the full axial length of the cartridge, end caps affixed to the ends of said screen and a perforated wall center tube having substantially lesser axial length than said outer cylindrical screen and being assembled therein with its relatively lower end in communication with said outlet passage and with its upper end terminating well short of the upper end cap and in substantially full oPen communication with the cylindrical space within said outer cylindrical screen extending above said center tube, a part-flow form-sustaining section completely filling the annular space between said outer cylindrical screen and said center tube, said section consisting of a ''''rope'''' of assorted cotton threads wound to annular configuration, and a full-flow section comprising a full-circular preform substantially completely filling said cylindrical space within said outer screen extending above said center tube and providing radial inward and axial paths of flow to the center tube, said full-flow section resting directly on and being supported substantially completely by said part-flow section.
Claim 3
Dependent Claim 23 words
A filter according to claim 1, wherein said full-flow section consists of a preformed body of crimped and texturized non-absorbent rayon viscose filaments.
Claim 4
Dependent Claim 41 words
A filter according to claim 1, wherein said full-flow section comprises relatively upper and lower layers of crimped and texturized non-absorbent rayon viscose filaments secured in face engagement by means permitting relatively free and unimpeded flow of liquid through the interface.
Claim 5
Dependent Claim 27 words
A filter according to claim 3, wherein the filaments making up said relatively upper and lower layers are of the order of 15 and 40 denier, respectively.

References Cited (Backward Citations)

US2328131A Cited
US2288426A Cited
US2834730A Cited
US3353680A Cited
US3452877A Cited

USPTO Annuity & Maintenance Windows

Annuity Stage Window Opens Payment Deadline Surcharge Period Until Estimated Fee Status
3.5 Years (Year 4) 1977-09-23 1978-03-25 1978-09-24 $2000.00 Window Closed / Lapsed
7.5 Years (Year 8) 1981-09-23 1982-03-25 1982-09-24 $3760.00 Window Closed / Lapsed
11.5 Years (Year 12) 1985-09-23 1986-03-25 1986-09-24 $7700.00 Window Closed / Lapsed

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