Patent US4434235A successfully refreshed from Google Patents.
US4434235A
Expired / Lapsed
US
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Method and apparatus for detecting nitrite ions in fluids
Assignee: Ben Gurion University of the Negev Research and Development Authority Ltd
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Filing: 1982-01-12
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Granted: 1984-02-28
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Expires: 2002-01-12
Abstract
Abstract A method for detecting the presence of nitrite ions in fluids by pretreating nitrite containing fluids to enhance the detectability with nitrite detecting reagents of the nitrite ions therein, which pretreatment step comprises passing the nitrite containing fluids through activated charcoal prior to combination with a nitrite detection reagent. Also a test kit for carrying out the above method.
Inventors
- 👤 Tavassa Rabi
- 👤 Eugen Szekely
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 16:47
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22; G01N31/227; B; B01; B01L; B01L3/00; B01L3/02; B01L3/021; B01L3/50; B01L3/508; Y; Y10; Y10T; Y10T436/00; Y10T436/17; Y10T436/173076; Y10T436/25; Y10T436/25125
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
48 words
A method for detecting the presence of nitrite ions in fluids comprising pretreating nitrite containing fluids to enhance the detectability of the nitrite ions therein with a nitrite detecting reagent, said pretreatment step comprising passing said fluid through activated charcoal prior to combination with said nitrite detection reagent.
Claim 2
Independent Claim
48 words
A method for detecting the presence of nitrite ions in fluids comprising pretreating nitrite containing fluids to enhance the detectability of the nitrite ions therein with a nitrite detecting reagent, said pretreatment step comprising passing said fluid through activated charcoal prior to combination with said nitrite detection reagent.
Claim 3
Dependent Claim
16 words
A method according to claim 1 wherein said activated charcoal is base treated prior to use.
Claim 4
Dependent Claim
17 words
A method according to claim 2 wherein said activated charcoal is treated with borax prior to use.
Claim 5
Dependent Claim
24 words
A method according to claim 3 comprising passing said fluid through a column of activated charcoal prior to combination with said nitrite detection reagent.
Claim 6
Dependent Claim
49 words
A method for detecting nitrate reducing bacteria in fluids derived from or containing organic matter by testing said fluids for nitrite ions in accordance with the method of claim 1, wherein after passing said fluid through said activated charcoal said treated fluid is combined with said nitrite detection reagent.
Claim 7
Dependent Claim
11 words
A method according to claim 5 wherein said fluid is urine.
Claim 8
Dependent Claim
32 words
A method accordance with claim 1, wherein the reagent for nitrite detection comprises (a) 0.5-5 parts 4,4'-sulfonyldianiline (b) 0.1-1 part N-(1-naphthyl)-ethylene diamine or its salts and (c) 50-1000 parts organic polycarboxylic acid.
Claim 9
Dependent Claim
94 words
A test kit for carrying out the method of claim 1 for the detection of the presence of nitrate ions in fluids said test kit comprising an open ended inner tube within an outer tube chamber having an air space between said tubes, said inner tube containing activated charcoal and filtering means and said outer tube chamber containing said nitrite detection reagent wherein liquid introduced into said test kit passes through said inner tube and the activated charcoal therein before entering the air space between said tubes for combination with said nitrite detection reagent.
Claim 10
Dependent Claim
59 words
A test kit for detecting nitrite ions according to claim 8 comprising an open ended inner tube within an outer tube chamber having an air space between said tubes, said inner tube containing activated charcoal and said outer tube chamber containing said dry powered water-soluble nitrite reagent comprising 4,4'-sulfonyldianiline, N-(1-naphthyl)-ethylene diamine or its salts and an organic polycarboxylic acid.
Claim 11
Dependent Claim
75 words
A test kit for carrying out the method of claim 1 for the detection of the presence of nitrite ions in fluids said test kit comprising a tube having a suction bulb at one end thereof and containing activated charcoal and nitrite detection reagent separately positioned and held inside a section of said tube wherein fluid sucked into said tube from the other end thereof passes sequentially through said activated charcoal and nitrite detection reagent.
Claim 12
Dependent Claim
61 words
A test kit according to claim 10 wherein said nitrite detecting reagent is positioned between said charcoal and said bulb and further comprising an enlarged chamber between said reagent and said bulb wherein fluid sucked into said tube by means of said bulb first passes through said charcoal and then through said reagent for collection and observation in said enlarged chamber.
Claim 13
Dependent Claim
28 words
A test kit according to claim 11 wherein said activated charcoal and nitrite detecting reagent are positioned and held in said tube by bounding liquid-permeable solid filtering means.
Claim 14
Dependent Claim
24 words
A test kit according to claim 11 wherein said reagent comprises (a) 4,4'-sulfonyldianiline (b) N-(1-naphthyl)-ethylene diamine or its salts and (c) organic polycarboxylic acid.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-02-27 | 1987-08-29 | 1988-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-27 | 1991-08-29 | 1992-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-27 | 1995-08-29 | 1996-02-28 | $7700.00 | Window Closed / Lapsed |