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US4256693A
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Multilayered integral chemical analysis element for the blood
Assignee: Fujifilm Holdings Corp
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Filing: 1979-06-06
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Granted: 1981-03-17
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Expires: 1999-06-06
Abstract
Abstract A multilayered integral chemical analysis element for the blood comprising a filter layer capable of removing formed components from the blood, a water-proof layer having at least one small opening therein, a porous spreading layer and a reagent layer laminated in this order.
Inventors
- 👤 Asaji Kondo
- 👤 Masao Kitajima
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:52
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
51 words
A multilayered integral chemical analysis element for a blood sample, said element comprising a filter layer capable of removing formed components comprising leucocytes, erythrocytes and platelets in the blood, a water-proof layer having at least one small opening therein, a porous spreading layer, and a reagent layer laminated in this order.
Claim 2
Dependent Claim
51 words
A multilayered integral chemical analysis element for a blood sample, said element comprising a filter layer capable of removing formed components comprising leucocytes, erythrocytes and platelets in the blood, a water-proof layer having at least one small opening therein, a porous spreading layer, and a reagent layer laminated in this order.
Claim 3
Dependent Claim
19 words
The element of claim 1 which further comprises a support for maintaining the laminated state of said four layers.
Claim 4
Dependent Claim
25 words
The element of claim 1, wherein said small opening is circular or triangular, or is a cut in the form of *, +, or -.
Claim 5
Dependent Claim
41 words
The element of claim 1, wherein the number of said small openings is one per spot of blood sample, and said small opening is circular or triangular and ranges in size from about 30 μm to about 5 mm in diameter.
Claim 6
Dependent Claim
54 words
The element of claim 1, wherein two or more small openings ranging in size from about 30 μm to about 0.5 mm in diameter are provided per spot of blood sample, said small openings being circular or triangular and being arranged within a circle having a diameter of about 1 mm to 5 mm.
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |