US3801466A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Uric acid assay and reagents therefor
Assignee: American Monitor Corp
•
Filing: 1971-12-02
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Granted: 1974-04-02
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Expires: 1991-12-02
Abstract
Abstract A colorimetric assay for uric acid, the assay being of a type which uses uricase to eliminate the uric acid in a blank test so that its specific effect can be detected by comparison with a specimen not having the uric acid effect eliminated, in which a buffer is used in both the test and the blank steps, thus avoiding the extra expense and error of protein-precipitation steps and other steps or other disadvantages of prior methods.
Inventors
- 👤 J Denney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:41
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/62; Y; Y10; Y10T; Y10T436/00; Y10T436/14; Y10T436/145555; Y10T436/147777; Y10T436/148888
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
27 words
The invention as set forth in claim 1 in a combination in which urea is used to eliminate turbidity of both the blank specimen and test specimen.
Claim 2
Dependent Claim
17 words
The invention as set forth in claim 1 in a combination in which the buffer contains borate.
Claim 3
Dependent Claim
23 words
The invention as set forth in claim 1 in which the color-producing reducing effect is measured by an alkaline phosphotungstic acid reagent system.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |