US5238737A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Use of polymer blend films as supports for diagnostic test strips
Assignee: Bayer Corp
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Filing: 1992-06-01
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Granted: 1993-08-24
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Expires: 2012-06-01
Abstract
Abstract The present invention is directed to the use of polymer blend films consisting of polycarbonate and polyalkylene terephthalate supports for diagnostic test strips.
Inventors
- 👤 Claus Burkhardt
- 👤 Thomas Doege
- 👤 Karlheinz Hildenbrand
- 👤 Werner Kroll
- 👤 Alexander Riebel
- 👤 Bernhard Schulte
- 👤 Philip R. Strom-Jensen
- 👤 Klaus Wehling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:59
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; C; C08; C08L; C08L69/00; Y; Y10; Y10T; Y10T428/00; Y10T428/25; Y10T428/256; Y10T428/31504; Y10T428/31507; Y10T428/31551; Y10T428/31565; Y10T428/31609; Y10T428/31786
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
42 words
A diagnostic test strip consisting essentially of the following combination: (a) a polyurethane matrix; (b) a supporting film of polycarbonate, polyalkylene terephthalate and titanium dioxide having a particle size less than 0.5 μm, wherein said supporting film is adhered to said matrix.
Claim 2
Dependent Claim
42 words
A diagnostic test strip consisting essentially of the following combination: (a) a polyurethane matrix; (b) a supporting film of polycarbonate, polyalkylene terephthalate and titanium dioxide having a particle size less than 0.5 μm, wherein said supporting film is adhered to said matrix.
Claim 3
Dependent Claim
32 words
The diagnostic test strip according to claim 1 wherein the supporting film comprises: (a) 40 to 75% by weight of thermoplastic polycarbonate; and (b) 60 to 25% by weight of polyalkylene terephthalate.
Claim 4
Dependent Claim
36 words
Process for the production of diagnostic test strips, wherein a polymer blend film consisting essentially of polycarbonate, polyalkylene terephthalate and titanium dioxide having a particle size less than 0.5 μm is coated with a polyurethane membrane.
Claim 5
Dependent Claim
36 words
Process for the production of diagnostic test strips, wherein a polymer blend film consisting essentially of polycarbonate, polyalkylene terephthalate and titanium dioxide having a particle size less than 0.5 μm is coated with a polyurethane membrane.
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) | 1996-08-23 | 1997-02-22 | 1997-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2000-08-23 | 2001-02-22 | 2001-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2004-08-23 | 2005-02-22 | 2005-08-24 | $7700.00 | Window Closed / Lapsed |