US4472499B1
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US4472499B1 - - Google Patents
Assignee: CNA Holdings LLC
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Filing: 1982-01-22
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Granted: 1988-11-08
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Expires: 2002-01-22
Abstract
Abstract Assay reagents for the determination of enzymes such as alpha -amylase, alpha -glucosidase, beta -glucosidase, and acid and alkaline phosphatases are described. The reagents comprise a substrate capable of releasing the chromophore p-nitrophenol at a rate proportional to the amount of enzyme being assayed and a buffer material that eliminates the temperature dependence of the chromophore.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:33
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/34; C12Q1/42; C12Q1/40; C12Q2334/00; C12Q2334/10; G; G01; G01N; G01N2333/00; G01N2333/90; G01N2333/914; G01N2333/924; Y; Y10; Y10S; Y10S435/00; Y10S435/81
Claims Analysis
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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) | 1991-11-08 | 1992-05-09 | 1992-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-08 | 1996-05-09 | 1996-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-08 | 2000-05-09 | 2000-11-08 | $7700.00 | Window Closed / Lapsed |