US4211532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Test composition, method and a test stick for detection of chloride ion in cow's milk
Assignee: Toyo Roshi Kaisha Ltd
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Filing: 1978-07-13
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Granted: 1980-07-08
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Expires: 1998-07-13
Abstract
Abstract Test composition and test stick for detection of chloride ion in cow's milk, which composition comprises a protected silver chromate colloidal substance, a surface active agent and a buffer agent having a pH value ranging from 2 to 7, and which test stick comprises a carrier, protected silver chromate colloidal substance, a surface active agent and a buffer agent having a pH value ranging from 2 to 7; and a method for producing the test stick.
Inventors
- 👤 Shizen Tobari
- 👤 Mariko Nakano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:56
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/84; G01N33/02; G01N33/04; Y; Y10; Y10T; Y10T436/00; Y10T436/19; Y10T436/193333
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
32 words
A composition for detecting chloride ion in cow milk, comprising a protected silver chromate colloidal substance, a surface active agent and a buffer agent having a pH value from 2 to 7.
Claim 2
Dependent Claim
32 words
A composition for detecting chloride ion in cow milk, comprising a protected silver chromate colloidal substance, a surface active agent and a buffer agent having a pH value from 2 to 7.
Claim 3
Dependent Claim
25 words
A composition according to claim 1, wherein the protected silver chromate colloidal substance is colloidal particles of silver chromate covered by a hydrophilic colloid-forming substance.
Claim 4
Dependent Claim
21 words
A composition according to claim 2, wherein the hydrophilic colloid-forming substance is gum arabic, albumin, gelatin, polyvinyl alcohol or polyvinyl pyrrolidone.
Claim 5
Dependent Claim
49 words
A method of detecting chloride ion in cow milk, comprising mixing the composition of claim 1 with a test sample of the cow milk, and comparing the color developed in the resultant mixture with a standard color chart which shows color graduations corresponding to differing concentrations of chloride ion.
Claim 6
Dependent Claim
36 words
A composition for detecting chloride ion in cow milk, comprising an absorbent carrier carrying a protected silver chromate colloidal substance, a surface active agent and a buffer agent having a pH value from 2 to 7.
Claim 7
Dependent Claim
36 words
A composition for detecting chloride ion in cow milk, comprising an absorbent carrier carrying a protected silver chromate colloidal substance, a surface active agent and a buffer agent having a pH value from 2 to 7.
Claim 8
Dependent Claim
25 words
A composition according to claim 5, wherein the protected silver chromate colloidal substance is colloidal particles of silver chromate covered by a hydrophilic colloid-forming substance.
Claim 9
Dependent Claim
21 words
A composition according to claim 6, wherein the hydrophilic colloid-forming substance is gum arabic, albumin, gelatin, polyvinyl alcohol or polyvinyl pyrrolidone.
Claim 10
Dependent Claim
53 words
A method of detecting chloride ion in cow milk, comprising immersing the composition of claim 5, in the form of a test stick, into the cow milk, and comparing the color developed on the resultant test stick with a standard color chart which shows color graduations corresponding to differing concentrations of chloride ion.
Claim 11
Independent Claim
66 words
A method for producing a test stick for detection of chloride ion in cow milk, comprising impregnating an absorbent carrier with a solution of a protected silver chromate colloidal substance, drying the impregnated carrier on a plate, immersing the dried carrier in a solution containing a surface active agent and a buffer agent having a pH value from 2 to 7, and drying the resultant carrier.
Claim 12
Independent Claim
66 words
A method for producing a test stick for detection of chloride ion in cow milk, comprising impregnating an absorbent carrier with a solution of a protected silver chromate colloidal substance, drying the impregnated carrier on a plate, immersing the dried carrier in a solution containing a surface active agent and a buffer agent having a pH value from 2 to 7, and drying the resultant carrier.
Claim 13
Dependent Claim
85 words
A method according to claim 9, wherein the solution of the protected silver chromate colloidal substance is obtained by the dropwise addition of a solution of 1-2 parts by weight of silver nitrate in 100-150 parts by weight of distilled water to a solution of 0.5-2 parts by weight of a chromate and 1-2 parts by weight of a protective colloidal substance in 100-150 parts by weight of distilled water, said addition being carried out while stirring said solution of chromate and protective colloidal substance.
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) | 1983-07-08 | 1984-01-07 | 1984-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-07-08 | 1988-01-07 | 1988-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-07-08 | 1992-01-07 | 1992-07-08 | $7700.00 | Window Closed / Lapsed |