US5792354A
Expired / Lapsed
US
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Filter well and method for its manufacture
Assignee: Global Life Sciences Solutions USA LLC
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Filing: 1995-02-10
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Granted: 1998-08-11
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Expires: 2015-02-10
Abstract
Abstract In a filter well having an inlet portion and an outlet portion and a filter arranged between these, the filter is carried by a support surface having a number of flow channels, extending radially towards an outlet. The ridges between the flow channels have a width of not more than about 0.2 mm whereby essentially the entire upper surface of the filter becomes active at filtration. The filter well is formed by forming of plastic in a forming device, whereby the flow channel pattern in the support surface for the filter is formed by a forming part in the forming device, wherein a negative corresponding to the flow channel pattern has been made in the surface of the forming part by a photolithographic etching process or by laser machining.
Inventors
- 👤 Arvi Aksberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 19:55
CPC Classifications
B; B29; B29C; B29C33/00; B29C33/42; B01; B01D; B01D29/00; B01D29/01; B01D29/012; B01D29/05; B01D29/085; B29L; B29L2031/00; B29L2031/14; Y; Y10; Y10S; Y10S264/00; Y10S264/48
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
88 words
A filter well having an inlet portion and an outlet portion and a filter arranged between these, wherein said filter is supported by a support surface in which there is a number of flow channels extending radially towards an outlet, wherein ridges are located between the flow channels, the upper parts of which ridges are rounded and in contact with the filter, and the ridges have a width of not more than about 0.2 mm, whereby essentially the entire upper surface of the filter becomes active at filtration.
Claim 2
Dependent Claim
88 words
A filter well having an inlet portion and an outlet portion and a filter arranged between these, wherein said filter is supported by a support surface in which there is a number of flow channels extending radially towards an outlet, wherein ridges are located between the flow channels, the upper parts of which ridges are rounded and in contact with the filter, and the ridges have a width of not more than about 0.2 mm, whereby essentially the entire upper surface of the filter becomes active at filtration.
Claim 3
Dependent Claim
23 words
The filter well according to claim 1, wherein the ridges have a width of not more than about 0.2 to about 0.05 mm.
Claim 4
Dependent Claim
21 words
The filter well according to claim 2, wherein the ridges have a width of about 0.1 mm to about 0.05 mm.
Claim 5
Dependent Claim
18 words
The filter well according to claim 1, wherein the upper parts of the ridges have a coarse surface.
Claim 6
Dependent Claim
17 words
The filter well according to claim 1, wherein the flow channels are mutually connected via cross channels.
Claim 7
Dependent Claim
24 words
The filter well according to claim 5, wherein the flow channels and cross channels have a width of not more than about 0.4 mm.
Claim 8
Dependent Claim
26 words
The filter well according to claim 5 or 6, wherein the flow channels and cross channels have a depth of not more than about 0.1 mm.
Claim 9
Dependent Claim
27 words
The filter well according to claim 5, wherein the bottom of the flow channels and cross channels has a surface fineness of about 0.4 μm or finer.
Claim 10
Dependent Claim
19 words
The filter well according to claim 1, wherein the depth of the flow channels increases gradually towards the outlet.
Claim 11
Independent Claim
144 words
A method for producing a filter well having an inlet portion and an outlet portion and a filter arranged between these, wherein said filter is supported by a support surface in which there is a number of flow channels extending radially towards an outlet, wherein ridges are located between the flow channels, the upper parts of which ridges are in contact with the filter, and have a width of not more than about 0.2 mm, whereby essentially the entire upper surface of the filter becomes active at filtration comprising: forming plastic in a forming device, wherein the flow channel pattern in the support surface for the filter is formed by a forming part in the forming device, wherein a negative corresponding to the flow channel pattern is made on the surface of the forming part by a photolithographic etching process or by laser machining.
Claim 12
Independent Claim
144 words
A method for producing a filter well having an inlet portion and an outlet portion and a filter arranged between these, wherein said filter is supported by a support surface in which there is a number of flow channels extending radially towards an outlet, wherein ridges are located between the flow channels, the upper parts of which ridges are in contact with the filter, and have a width of not more than about 0.2 mm, whereby essentially the entire upper surface of the filter becomes active at filtration comprising: forming plastic in a forming device, wherein the flow channel pattern in the support surface for the filter is formed by a forming part in the forming device, wherein a negative corresponding to the flow channel pattern is made on the surface of the forming part by a photolithographic etching process or by laser machining.
Claim 13
Dependent Claim
21 words
The filter well according to claim 6, wherein the flow channels have a width of not more than about 0.1 mm.
Claim 14
Dependent Claim
21 words
The filter well according to claim 7, wherein the flow channels have a depth of not more than about 0.05 mm.
Claim 15
Dependent Claim
16 words
The method according to claim 10, wherein the flow channels are mutually connected via cross channels.
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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) | 2001-08-10 | 2002-02-09 | 2002-08-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2005-08-10 | 2006-02-09 | 2006-08-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2009-08-10 | 2010-02-09 | 2010-08-11 | $7700.00 | Window Closed / Lapsed |