US3750889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter tube
Assignee: Individual
•
Filing: 1971-06-17
•
Granted: 1973-08-07
•
Expires: 1991-06-17
Abstract
Abstract A filter tube comprising a perforated core, a connector at one end of the core, a plug at the other end of the core and a filter sleeve overlying the core. A core support or stabilizer is placed within the core, and comprises a rigid helical member. A channeled perforated drain screen is positioned between the filter sleeve and the core. The filter sleeve is removable and replaceable. The drain screen directs the filtered fluid passing through the filter sleeve into and through the core in laminar flow.
Inventors
- 👤 W Acosta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 01:21
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/13; B01D29/15; B01D29/19; B01D29/50; B01D29/52; B01D29/88; B01D29/92; B01D29/925; B01D2201/00; B01D2201/04; B01D2201/043; B01D2201/0446; B01D2201/28; B01D2201/287
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
130 words
A filter tube comprising a tubular core, said core having a plurality of perforations passing therethrough, a tubular filter sleeve and a tubular drain screen positioned between said core and said filter sleeve, said drain screen having channels formed therein, with each of said channels being in fluid communication with at least one of the perforations in said core, said drain screen comprising a first plurality of spaced parallel bars extending in a first direction and a second plurality of spaced parallel bars extending in a second direction, said second plurality of parallel bars overlying said first plurality of parallel bars to form said channels, said second plurality of bars being inclined, whereby fluid passing through said filter sleeve passes in laminar flow in said channels and through said perforations.
Claim 2
Dependent Claim
130 words
A filter tube comprising a tubular core, said core having a plurality of perforations passing therethrough, a tubular filter sleeve and a tubular drain screen positioned between said core and said filter sleeve, said drain screen having channels formed therein, with each of said channels being in fluid communication with at least one of the perforations in said core, said drain screen comprising a first plurality of spaced parallel bars extending in a first direction and a second plurality of spaced parallel bars extending in a second direction, said second plurality of parallel bars overlying said first plurality of parallel bars to form said channels, said second plurality of bars being inclined, whereby fluid passing through said filter sleeve passes in laminar flow in said channels and through said perforations.
Claim 3
Dependent Claim
33 words
The filter tube of claim 1 wherein said core has an upper end and a lower end, and further including means sealing said lower end and a connector formed on said upper end.
Claim 4
Dependent Claim
28 words
The filter tube of claim 1 wherein the amount of perforated surface in said drain screen is in excess of the amount of perforated surface in said core.
Claim 5
Dependent Claim
38 words
The filter tube of claim 1 wherein said drain screen is molded from a plastic, and said second plurality of bars intersect with said first plurality of bars, with said bars being joined at their points of intersection.
Claim 6
Dependent Claim
57 words
The filter tube of claim 1 and further including a stabilizer within said core, said stabilizer comprising a central bar and a plurality of blades emanating from said central bar, said blades being inclined upwardly around said bar and passing around said bar in a helical pattern, thereby forming helical channels between each adjacent pair of blades.
Claim 7
Dependent Claim
52 words
The filter tube of claim 5 wherein said core is circular in cross-section and said stabilizer defines a cylindrical area, with the outer diameter of said stabilizer being substantially equal to, but slightly less than, the inner diameter of said core, whereby said stabilizer supports said core and retains its circular cross-section.
References Cited (Backward Citations)
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US3394815A
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US3442391A
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |