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US4529709A
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Method for determination of 5-aminosalicylic acid
Assignee: Nitto Boseki Co Ltd
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Filing: 1983-05-12
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Granted: 1985-07-16
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Expires: 2003-05-12
Abstract
Abstract A method for the determination of 5-aminosalicylic acid, which comprises measuring the color developed in an alkaline medium by an oxidative condensation product formed by the condensation of an o-alkylphenol represented by the general formula <IMAGE> (wherein R1 represents an ethyl, isopropyl or sec-butyl group) with 5-aminosalicylic acid of the formula <IMAGE> in the presence of a peroxide.
Inventors
- 👤 Katsuyuki Takabayashi
- 👤 Muneo Soeta
- 👤 Takeshi Nagasawa
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 16:23
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; C; C12; C12Q; C12Q1/00; C12Q1/34; C12Q1/37; C12Q1/48; Y; Y10; Y10S; Y10S436/00; Y10S436/904; Y10T; Y10T436/00; Y10T436/17; Y10T436/173845
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
58 words
A method for the determination of 5-aminosalicylic acid, which comprises measuring the color developed in an alkaline medium by an oxidative condensation product formed by the condensation of an o-alkylphenol represented by the general formula (wherein R 1 represents an ethyl, isopropyl or sec-butyl group) with 5-aminosalicylic acid of the formula ##STR5## in the presence of a peroxide.
Claim 2
Independent Claim
58 words
A method for the determination of 5-aminosalicylic acid, which comprises measuring the color developed in an alkaline medium by an oxidative condensation product formed by the condensation of an o-alkylphenol represented by the general formula (wherein R 1 represents an ethyl, isopropyl or sec-butyl group) with 5-aminosalicylic acid of the formula ##STR5## in the presence of a peroxide.
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) | 1988-07-15 | 1989-01-14 | 1989-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-15 | 1993-01-14 | 1993-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-15 | 1997-01-14 | 1997-07-16 | $7700.00 | Window Closed / Lapsed |