US4582589A
Expired / Lapsed
US
⏱️ 0.0 years remaining
pH sensor
Assignee: Terumo Corp
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Filing: 1985-06-26
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Granted: 1986-04-15
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Expires: 2005-06-26
Abstract
Abstract A pH sensor includes a substrate formed of an electrically conductive carbon material. A hydrogen ion-sensitive layer is formed on the substrate surface. The layer is formed of an electrooxidation polymer of a nitrogen-containing aromatic compound selected from the group consisting of 1-aminopyrene and a mixture of 1-aminopyrene and pyridine.
Inventors
- 👤 Norihiko Ushizawa
- 👤 Tsutomu Murakami
- 👤 Takeshi Shimomura
- 👤 Noboru Oyama
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:17
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/28; G01N27/30; G01N27/333; G01N27/3335
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
52 words
A pH sensor comprising: a substrate formed of an electrically conductive carbon material; and a hydrogen ion-sensitive layer formed on the substrate surface, said hydrogen ion-sensitive layer being formed of an electrooxidation polymer of a nitrogen-containing aromatic compound selected from the group consisting of 1-aminopyrene and a mixture of 1-aminopyrene and pyridine.
Claim 2
Dependent Claim
52 words
A pH sensor comprising: a substrate formed of an electrically conductive carbon material; and a hydrogen ion-sensitive layer formed on the substrate surface, said hydrogen ion-sensitive layer being formed of an electrooxidation polymer of a nitrogen-containing aromatic compound selected from the group consisting of 1-aminopyrene and a mixture of 1-aminopyrene and pyridine.
Claim 3
Dependent Claim
31 words
The pH sensor according to claim 1, wherein said hydrogen ion-sensitive layer is formed of an electrolytic oxidation copolymer consisting of substantially the same molar amount of 1-aminopyrene and pyridine units.
Claim 4
Dependent Claim
22 words
The pH sensor according to claim 1, wherein the thickness of the hydrogen ion-sensitive layer ranges between 1 μm and 1 mm.
Claim 5
Dependent Claim
27 words
The pH sensor according to claim 1, which further comprises a protective layer formed on the hydrogen ion-sensitive layer, said protective layer being pervious to hydrogen ions.
Claim 6
Dependent Claim
32 words
The pH sensor according to claim 4, wherein said protective layer is formed of a material selected from the group consisting of poly(hydroxyethyl methacrylate), nitro cellulose, acetyl cellulose, regenerated cellulose and polycarbonate.
Claim 7
Dependent Claim
21 words
The pH sensor according to claim 4, wherein the thickness of the protective layer ranges between 0.1 μm and 300 μm.
Claim 8
Dependent Claim
41 words
The pH sensor according to claim 1, which further comprises a protective layer formed on the hydrogen ion-sensitive layer, said protective layer being pervious to hydrogen ions; and the thickness of said protective layer being between 0.1 μm and 300 μm.
Claim 9
Dependent Claim
31 words
The pH sensor according to claim 7, wherein said hydrogen ion-sensitive layer is formed of an electrolytic oxidation copolymer consisting of substantially the same molar amount of 1-aminopyrene and pyridine units.
Claim 10
Dependent Claim
22 words
The pH sensor according to claim 8 wherein said hydrogen ion-sensitive layer formed of said electrooxidation copolymer is partially in reduced form.
References Cited (Backward Citations)
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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) | 1989-04-14 | 1989-10-14 | 1990-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-04-14 | 1993-10-14 | 1994-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-04-14 | 1997-10-14 | 1998-04-15 | $7700.00 | Window Closed / Lapsed |