US4537680A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral fluid filter and capillary
Assignee: Leland Stanford Junior University
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Filing: 1984-06-04
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Granted: 1985-08-27
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Expires: 2004-06-04
Abstract
Abstract A comb filter including a first plurality of generally parallel grooves and a capillary including a second groove connected to the first plurality of grooves are integrally formed in a substrate such as by selective etching a surface of a semiconductor substrate. A cover is affixed to the surface and covers the etched grooves. An input line is connected to the filter and an output line is connected to the capillary. A second comb filter can be included in the output line.
Inventors
- 👤 Phillip W. Barth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:13
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/44; A; A61; A61M; A61M5/00; A61M5/14; A61M5/165; F; F16; F16L; F16L55/00; F16L55/02; F16L55/027; F16L55/0279; A61M2205/00; A61M2205/02; A61M2205/0244
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
123 words
An integral filter and capillary comprising a substrate having a major surface, a first recessed region on said surface and in said substrate including a first plurality of generally parallel grooves, a second groove on said surface and in said substrate connected with said first recessed region adjacent to one end of said first plurality of grooves, said second groove having cross-sectional dimensions greater than the cross-sectional dimensions of said first plurality of grooves, a cover affixed to said major surface and covering said first recessed region and said second groove, a fluid input to said first recessed region adjacent to one end of said first plurality of grooves opposite from said second groove, and a fluid output connected to said second groove.
Claim 2
Dependent Claim
123 words
An integral filter and capillary comprising a substrate having a major surface, a first recessed region on said surface and in said substrate including a first plurality of generally parallel grooves, a second groove on said surface and in said substrate connected with said first recessed region adjacent to one end of said first plurality of grooves, said second groove having cross-sectional dimensions greater than the cross-sectional dimensions of said first plurality of grooves, a cover affixed to said major surface and covering said first recessed region and said second groove, a fluid input to said first recessed region adjacent to one end of said first plurality of grooves opposite from said second groove, and a fluid output connected to said second groove.
Claim 3
Dependent Claim
24 words
The integral filter and capillary as defined by claim 1 wherein said substrate comprises a semiconductor body and said cover comprises a glass plate.
Claim 4
Dependent Claim
28 words
The integral filter and capillary as defined by claim 2 wherein said fluid input includes a first hole through said plate in communication with said first recessed region.
Claim 5
Dependent Claim
73 words
The integral filter and capillary as defined by claim 3 wherein said fluid output includes a second recessed region on said surface and in said substrate including a second plurality of generally parallel grooves, said second groove being connected to said second recessed region adjacent to one end of said second plurality of grooves, said cross-sectional dimensions of said second groove being greater than the cross-sectional dimensions of said second plurality of grooves.
Claim 6
Dependent Claim
29 words
The integral filter and capillary as defined by claim 4 wherein said fluid output further includes a second hole through said plate in communication with said second recessed region.
Claim 7
Dependent Claim
72 words
The integral filter and capillary as defined by claim 1 wherein said fluid output includes a second recessed region on said surface and in said substrate including a second plurality of generally parallel grooves, said second groove being connected to said second recessed region at one end of said second plurality of grooves, said cross-sectional dimensions of said second groove being greater than the cross-sectional dimensions of said second plurality of grooves.
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) | 1988-08-26 | 1989-02-25 | 1989-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-08-26 | 1993-02-25 | 1993-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-08-26 | 1997-02-25 | 1997-08-27 | $7700.00 | Window Closed / Lapsed |