USRE28575E
Expired / Lapsed
US
⏱️ 0.0 years remaining
Indicator for detecting hydrogen peroxide and peroxidative compounds containing alpha naphthoflavone
Assignee: —
•
Filing: 1974-04-08
•
Granted: 1975-10-21
•
Expires: 1994-04-08
Abstract
Abstract Alpha naphthoflavone is an excellent indicator for detecting hydrogen peroxide and peroxidative compounds such as hemoglobin. When formulated with either a peroxidative active compound or a peroxide, this indicator provides a very sensitive chromogenic response to the presence of said constituents in aqueous fluids.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:35
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/228; C; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/28; C12Q1/54; G01N33/00; G01N33/48; G01N33/50; G01N33/72; G01N33/721; G01N33/725; C12Q2326/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
51 words
IN A COMPOSITION FOR DETECTING HYDROGEN PEROXIDE OR PEROXIDATIVE ACTIVE COMPOUNDS UTILIZING THE CATALYTIC OXIDATION OF AN INDICATOR SYSTEM (DYESTUFF) BY HYDROGEN PEROXIDE IN THE PRESENCE OF THE PEROXIDATIVE ACTIVE COMPOUND, THE IMPROVEMENT WHICH COMPRISES THE USE OF A-NAPHTHOFLAVONE IN COMBINATION WITH WATER SOLUBLE IODIDE SALT AS THE INDICATOR SYSTEM (DYESTUFF)
Claim 2
Dependent Claim
51 words
IN A COMPOSITION FOR DETECTING HYDROGEN PEROXIDE OR PEROXIDATIVE ACTIVE COMPOUNDS UTILIZING THE CATALYTIC OXIDATION OF AN INDICATOR SYSTEM (DYESTUFF) BY HYDROGEN PEROXIDE IN THE PRESENCE OF THE PEROXIDATIVE ACTIVE COMPOUND, THE IMPROVEMENT WHICH COMPRISES THE USE OF A-NAPHTHOFLAVONE IN COMBINATION WITH WATER SOLUBLE IODIDE SALT AS THE INDICATOR SYSTEM (DYESTUFF)
Claim 3
Dependent Claim
23 words
A composition as claimed in claim 1 in which Alpha -naphthoflavone is present in about 0.05% to 0.30% by weight of said composition.
Claim 4
Dependent Claim
24 words
A composition as claimed in claim 1 in which the peroxidative active compound is selected from the group consisting of peroxidase, hemoglobin and molybdate.
Claim 5
Dependent Claim
23 words
A composition as claimed in claim 3 in which the molybdate is present in about 0.1% to 1.5% by weight of said composition.
Claim 6
Dependent Claim
23 words
A composition as claimed in claim 3 in which the peroxidase is present in about 0.01% to 0.05% by weight of said composition.
Claim 7
Dependent Claim
27 words
A composition as claimed in claim 1 (6) in which the water soluble iodide salt is present in about 0.25% to 1.5% by weight of said composition.
Claim 8
Dependent Claim
24 words
A composition for detecting glucose in aqueous fluids which comprises glucose oxidase, a peroxidative active material, a water soluble iodide salt, and Alpha -naphthoflavone.
Claim 9
Dependent Claim
24 words
A composition for detecting glucose in aqueous fluids which comprises glucose oxidase, a peroxidative active material, a water soluble iodide salt, and Alpha -naphthoflavone.
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) | 1978-10-20 | 1979-04-21 | 1979-10-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-20 | 1983-04-21 | 1983-10-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-20 | 1987-04-21 | 1987-10-21 | $7700.00 | Window Closed / Lapsed |