US4855108A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Member of analytical element for the analysis of liquid sample containing solid
Assignee: Fujifilm Holdings Corp
•
Filing: 1987-09-16
•
Granted: 1989-08-08
•
Expires: 2007-09-16
Abstract
Abstract A member of an analytical element for the analysis of a liquid sample containing solid material, comprising a volume filtration layer composed of a fibrous material and a spreading layer having a liquid-retaining capacity larger than that of the volume filtration layer, in which the volume filtration layer and the spreading layer are united to give an integrated structure. The spreading layer may be composed of a fibrous material, a woven cloth, a knitted cloth or a non-fibrous porous medium.
Inventors
- 👤 Nobuhito Masuda
- 👤 Takeshi Igarashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 19:17
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/525; Y; Y10; Y10S; Y10S435/00; Y10S435/805; Y10T; Y10T436/00; Y10T436/25; Y10T436/25375
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
122 words
A filtration element for use in the analysis of a liquid sample containing solid material which comprises a volume filtration layer and a spreading layer having a liquid-retaining capacity larger than that of the volume filtration layer, wherein the volume filtration layer is made of fibrous material having a diameter of 0.1 to 1.0 μm and a wavelength of 10-4,000 μm and has a density of 0.02 to 0.1 g/cm 3 , the spreading layer is made of woven or knitted cloth, the volume filtration layer and the spreading layer are united to give an integrated structure to have an interface between both layers, and the fibrous material of the volume filtration layer is interlocked with the spreading layer at the interface.
Claim 2
Dependent Claim
122 words
A filtration element for use in the analysis of a liquid sample containing solid material which comprises a volume filtration layer and a spreading layer having a liquid-retaining capacity larger than that of the volume filtration layer, wherein the volume filtration layer is made of fibrous material having a diameter of 0.1 to 1.0 μm and a wavelength of 10-4,000 μm and has a density of 0.02 to 0.1 g/cm 3 , the spreading layer is made of woven or knitted cloth, the volume filtration layer and the spreading layer are united to give an integrated structure to have an interface between both layers, and the fibrous material of the volume filtration layer is interlocked with the spreading layer at the interface.
Claim 3
Dependent Claim
22 words
The filtration element as claimed in claim 1 wherein said spreading layer has a density of 0.05 to 1.0 g/cm 3 .
Claim 4
Dependent Claim
34 words
The filtration element as claimed in claim 1 wherein the spreading layer is made of woven cloth manufactured using fibers of a diameter of 20S to 150S in terms of cotton spun yarn count.
Claim 5
Dependent Claim
34 words
The filtration element as claimed in claim 1 wherein the spreading layer is made of knitted cloth manufactured using fibers of a diameter of 40S to 150S in terms of cotton spun yarn count.
Claim 6
Dependent Claim
123 words
A filtration element for use in the analysis of a liquid sample containing solid material which comprises a volume filtration layer and a spreading layer having a liquid-retaining capacity larger than that of the volume filtration layer, wherein the volume filtration layer is made of fibrous material having a diameter of 0.1 to 1.0 μm and a length of 10-4,000 μm and has a density of 0.02 to 0.1 g/cm 3 , the spreading layer is made of non-fibrous porous material the volume filtration layer and the spreading layer are united to give an integrated structure to have an interface between both layers, and the fibrous material of the volume filtration layer is anchored to micropores of the spreading layer at the interface.
Claim 7
Dependent Claim
123 words
A filtration element for use in the analysis of a liquid sample containing solid material which comprises a volume filtration layer and a spreading layer having a liquid-retaining capacity larger than that of the volume filtration layer, wherein the volume filtration layer is made of fibrous material having a diameter of 0.1 to 1.0 μm and a length of 10-4,000 μm and has a density of 0.02 to 0.1 g/cm 3 , the spreading layer is made of non-fibrous porous material the volume filtration layer and the spreading layer are united to give an integrated structure to have an interface between both layers, and the fibrous material of the volume filtration layer is anchored to micropores of the spreading layer at the interface.
Claim 8
Dependent Claim
17 words
The filtration element as claimed in claim 5 wherein the non-fibrous porous material is a blushed polymer.
References Cited (Backward Citations)
US2761791A
Cited
US2881072A
Cited
US3817379A
Cited
US3992158A
Cited
US4256693A
Cited
US4292272A
Cited
EP0045476A1
Cited
US4477575A
Cited
US4477575B1
Cited
US4551307A
Cited
JPS6066164A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-08-07 | 1993-02-06 | 1993-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-08-07 | 1997-02-06 | 1997-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-08-07 | 2001-02-06 | 2001-08-08 | $7700.00 | Window Closed / Lapsed |