Patent US3718543A successfully refreshed from Google Patents.
US3718543A
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Bacterioria test material
Assignee: Bio Derivatives Corp
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Filing: 1971-01-04
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Granted: 1973-02-27
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Expires: 1991-01-04
Abstract
Abstract An improved bacteriuria test material is made up of an admixture of sulfanilamide and N-(1-Naphthyl) ethylene-diamine dihydrochloride. In one embodiment a solution of these materials is employed to impregnate a paper strip or a cotton swab and then permitted to dry. In use when the resulting test material, such as the aforementioned impregnnated paper or cotton swab, is brought into contact or wetted with a test specimen containing nitrite, indicating the presence of bacteria in the urine or the test specimen, the paper or swab undergoes a fairly rapid color change to a rose or red color.
Inventors
- 👤 J Lagomarsino
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 02:30
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/02; C12Q1/04; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/52; G01N33/521; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
19 words
A composition in accordance with claim 1 wherein said admixture is compressed into tablet or disc or wafer form.
Claim 2
Dependent Claim
32 words
A composition in accordance with claim 1 wherein said admixture contains a major amount of a white-colored, water-insoluble, inert, finely divided carrier or diluent, the resulting admixture being compressed into tablet form.
Claim 3
Dependent Claim
12 words
A composition in accordance with claim 1 wherein said sulfanilamide is sulfanilamide.
Claim 4
Dependent Claim
17 words
A test material in accordance with claim 1 wherein said admixture is disposed in an anhydrous carrier.
Claim 5
Dependent Claim
14 words
A test material in accordance with claim 5 wherein said carrier is an alcohol.
Claim 6
Dependent Claim
14 words
A test material in accordance with claim 5 wherein said carrier is a ketone.
Claim 7
Dependent Claim
15 words
A test material in accordance with claim 5 wherein said carrier is a solid carrier.
Claim 8
Dependent Claim
14 words
A test material in accordance with claim 5 wherein said carrier is a paper.
Claim 9
Dependent Claim
21 words
A test material in accordance with claim 9 wherein said paper is protected by a strippable substantially moisture-impermeable film or coating.
Claim 10
Dependent Claim
15 words
A test material in accordance with claim 5 wherein said carrier is a cotton swab.
Claim 11
Dependent Claim
20 words
A test material in accordance with claim 11 wherein said cotton swab is affixed to a wooden or plastic holder.
Claim 12
Dependent Claim
22 words
A test material in accordance with claim 12 wherein said cotton swab is enclosed within a removable substantially moisture-impermeable envelope or coating.
Claim 13
Dependent Claim
19 words
A test material in accordance with claim 5 wherein said carrier is a solid, porous or permeable water-insoluble carrier.
Claim 14
Dependent Claim
43 words
In a bacteriuria test wherein the specimen to be tested is brought into contact with a reagent material which undergoes a change in color, the improvement which comprises employing as said reagent a material which consists essentially of a sulfanilamide and N-(1-Naphthyl)ethylenediamine dihydrochloride.
Claim 15
Dependent Claim
23 words
A method in accordance with claim 15 wherein said reagent consists essentially of sulfanilamide and N-(1-Naphthyl)ethylenediamine dihydrochloride disposed on a porous, water-insoluble carrier.
Claim 16
Dependent Claim
12 words
A method in accordance with claim 16 wherein said carrier is paper.
Claim 17
Dependent Claim
13 words
A method in accordance with claim 16 wherein said carrier is cotton swab.
Claim 18
Dependent Claim
33 words
A method in accordance with claim 18 wherein said sulfanilamide and said N-(1-Naphthyl)ethylenediamine dihydrochloride are present in the relative proportions in parts by weight or mols in the range 1:10 to 10:1, respectively.
Claim 19
Dependent Claim
42 words
A bacteriuria test paper consisting essentially of paper impregnated with a sulfanilamide and N-(1-Naphthyl) ethylenediamine dihydrochloride wherein said sulfanilamide and said N-(1-Naphthyl)ethylenediamine dihydrochloride are present in the relative proportions in parts by weight or mols in the range 1:10 to 10:1, respectively.
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) | 1976-02-27 | 1976-08-28 | 1977-02-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-27 | 1980-08-28 | 1981-02-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-27 | 1984-08-28 | 1985-02-27 | $7700.00 | Window Closed / Lapsed |