US4287368A
Expired / Lapsed
US
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Method for preparing vanillin and composition therefor
Assignee: GE Healthcare Ltd
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Filing: 1980-02-26
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Granted: 1981-09-01
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Expires: 2000-02-26
Abstract
Abstract A new radioenzymatic assay for catecholamines utilizing the catechol-0-methyl transferase transfer of a methyl group from a labeled methyl donor to the catecholamines followed by isolation of the 0-methylated( 3 H)catecholamine and the subsequent measurement of radioactivity.
Inventors
- 👤 Garland A. Johnson
- 👤 Jacob D. Peuler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 22:54
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/48; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/58; G01N33/60
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A method for oxidizing metanephrine or normetanephrine to vanillin which comprises contacting the metanephrine or normetanephrine with periodate in the contact presence of silica gel.
Claim 2
Independent Claim
25 words
A method for oxidizing metanephrine or normetanephrine to vanillin which comprises contacting the metanephrine or normetanephrine with periodate in the contact presence of silica gel.
Claim 3
Dependent Claim
19 words
A method in accordance with claim 1 wherein the metanephrine or normetanephrine is tritium labeled at the methoxy position.
Claim 4
Dependent Claim
19 words
A composition which comprises a catecholamine selected from the group consisting of metanephrine and normetanephrine, silica gel and periodate.
Claim 5
Dependent Claim
19 words
A composition which comprises a catecholamine selected from the group consisting of metanephrine and normetanephrine, silica gel and periodate.
Claim 6
Dependent Claim
17 words
A composition in accordance with claim 3 wherein the catecholamine is tritium labeled at the methyl position.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-08-31 | 1985-03-02 | 1985-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-08-31 | 1989-03-02 | 1989-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-08-31 | 1993-03-02 | 1993-09-01 | $7700.00 | Window Closed / Lapsed |