Patent EP0407800A2 successfully refreshed from Google Patents.
EP0407800A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Analysis method for determining substances from biological fluids
Assignee: Bayer Corp
•
Filing: 1990-06-26
•
Granted: —
•
Expires: 2010-06-26
Abstract
Abstract A test strip for analyzing substances from biological fluids is disclosed in which the matrix comprises a porous membrane having an asymmetric pore structure which is designed for application of the biological fluid to the large pore side of the membrane and in which a determination of the biological fluid is made on the opposite side of the membrane containing a small pore size. The membrane contains anionic surfactant in an amount of 1 to about 4% by weight based on the polymer casting solution used to form the porous membrane.
Inventors
- 👤 Karlheinz Dr. Hildenbrand
- 👤 Klaus Dr. Wehling
- 👤 Heinz Dr. Pudleiner
- 👤 Helmut Dr. Engelhard
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 09:13
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/54; B; B01; B01L; B01L3/00; B01L3/50; B01L3/502; B01L3/5023; C12Q1/58; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521; G01N33/523; G01N33/525; G01N33/526; B01L2300/00; B01L2300/06; B01L2300/0681; B01L2300/08; B01L2300/0809; B01L2300/0825; B01L2300/0887; B01L2400/00; B01L2400/04; B01L2400/0403; B01L2400/0406
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
82 words
A test strip for analyzing substances from biological fluids, which test strip consists essentially of a porous membrane having asymmetric pore structure attached to a substrate, the porous membrane characterized by having a sample application surface of large pore size and an opposite surface of fine pore size adjacent to said substrate; and wherein the membrane contains anionic surfactant in an amount of about 1 to about 4 percent by weight, based on a polymer casting solution used to form said membrane.
Claim 2
Dependent Claim
82 words
A test strip for analyzing substances from biological fluids, which test strip consists essentially of a porous membrane having asymmetric pore structure attached to a substrate, the porous membrane characterized by having a sample application surface of large pore size and an opposite surface of fine pore size adjacent to said substrate; and wherein the membrane contains anionic surfactant in an amount of about 1 to about 4 percent by weight, based on a polymer casting solution used to form said membrane.
Claim 3
Dependent Claim
21 words
The test strip of claim 1 in which the asymmetric membrane has an active separation layer of 0.2 to 2.9 µm.
Claim 4
Dependent Claim
22 words
The test strip of claim 1 in which a sample application layer of 10 to 250 µm is applied to the membrane.
Claim 5
Dependent Claim
19 words
The test strip of claim 1 in which the porous membrane has a thickness of up to 50 µm.
Claim 6
Dependent Claim
12 words
The test strip of claim 1 in which the substrate is transparent.
Claim 7
Dependent Claim
21 words
The test strip of claim 1 in which an air space exists between a portion of the membrane and the substrate.
Claim 8
Dependent Claim
32 words
The test strip of claim 1 in which the strip is covered by a polymer film which has an opening for the introduction of a sample of the biological fluid being analyzed.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
Maintenance schedule is calculated for granted US utility patents.