US4842712A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for measuring ion activity
Assignee: Fujifilm Holdings Corp
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Filing: 1987-02-02
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Granted: 1989-06-27
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Expires: 2007-02-02
Abstract
Abstract In a device for measuring ion activity in a liquid sample such as a body fluid comprising at least one pair of ion-selective electrodes selectively responsive to a specific ion, a porous liquid distributing member for feeding a liquid sample to one electrode of the pair of electrodes, a porous liquid distributing member for feeding a reference liquid to another electrode of the pair of electrodes and a porous bridge for electrically connecting both liquids to each other, the improvement wherein the liquid distributing members are made of a nonwoven fabric composed of cellulosic long fibers.
Inventors
- 👤 Osamu Seshimoto
- 👤 Masaaki Terashima
- 👤 Yoshio Saito
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 19:43
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335; G01N27/307
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
95 words
In a device for measuring ion activity in a liquid sample comprising at least one pair of ion-selective electrodes selectively responsive to a specific ion, a porous liquid distributing member for feeding a liquid sample to one electrode of the pair of electrodes, a porous liquid distributing member for feeding a reference liquid to another electrode of the pair of electrodes and a porous bridge for electrically connecting both liquids to each other, the improvement wherein said liquid distributing members are made of a nonwoven fabric composed of cellulosic long fibers prepared from cotton linters.
Claim 2
Dependent Claim
95 words
In a device for measuring ion activity in a liquid sample comprising at least one pair of ion-selective electrodes selectively responsive to a specific ion, a porous liquid distributing member for feeding a liquid sample to one electrode of the pair of electrodes, a porous liquid distributing member for feeding a reference liquid to another electrode of the pair of electrodes and a porous bridge for electrically connecting both liquids to each other, the improvement wherein said liquid distributing members are made of a nonwoven fabric composed of cellulosic long fibers prepared from cotton linters.
Claim 3
Dependent Claim
22 words
The device for measuring ion activity as claimed in claim 1, wherein there are provided at least two pairs of ion-selective electrodes.
Claim 4
Dependent Claim
34 words
The device for measuring ion activity as claimed in claim 1, wherein said nonwoven fabric is one prepared from a spinning solution of cotton linters dissolved in Schweizer's reagent by a spun bonding method.
Claim 5
Dependent Claim
46 words
The device for measuring ion activity as claimed in claim 1, wherein said liquid distributing members are porous members which absorb blood in an amount of as at least 10 times by weight as much as that of said member for a period of 3 seconds.
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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) | 1992-06-26 | 1992-12-26 | 1993-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-06-26 | 1996-12-26 | 1997-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-06-26 | 2000-12-26 | 2001-06-27 | $7700.00 | Window Closed / Lapsed |