US3634038A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Device for the quantitative colorimetric analysis of fluids
Assignee: GORDON A RAMPY
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Filing: 1969-09-10
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Granted: 1972-01-11
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Expires: 1989-09-10
Abstract
Abstract A device for quantitative colorimetric analysis of fluids which consists of a transparent tube of predetermined size with a single frangible tip, containing a liquid colorimetric reagent and evacuated to a predetermined degree to insure that on immersion of the frangible tip in the fluid to be analyzed, followed by fracture of the tip, a predetermined quantity of sample will be forced into the tube so that on mixing of the contents color will be developed proportionately to the concentration of the material being analyzed for in the sample fluid. The amount of material being analyzed for can then be ascertained by comparison with a color chart or a set of color tubes.
Inventors
- 👤 Gordon A Rampy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 20:04
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
22 words
The tube of claim 1, in which the mixing means is glass beads included in the tube with the liquid colorimetric reagent.
Claim 2
Dependent Claim
18 words
The tube of claim 1, in which the reagent is an aqueous solution of reduced 5,5-indigo disulfonic acid.
Claim 3
Dependent Claim
17 words
The tube of claim 1, in which the reagent is an aqueous acidified solution of potassium thiocyanate.
Claim 4
Dependent Claim
16 words
The tube of claim 1, in which the reagent is an aqueous acidified solution of orthotolidine.
Claim 5
Dependent Claim
40 words
The tube of claim 1, in which the vacuum in the tube ensures that, on breaking the tip in the fluid to be analyzed, the tube will be essentially full of liquid except for a gas bubble which facilitates mixing.
Claim 6
Dependent Claim
12 words
The tube of claim 1 in which the tube is of glass.
Claim 7
Dependent Claim
33 words
The tube of claim 7 in which the frangible tip portion is coated with an elastic coating which retains the glass fragments formed on breaking the tip to introduce sample into the device.
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) | 1975-01-10 | 1975-07-12 | 1976-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-10 | 1979-07-12 | 1980-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-10 | 1983-07-12 | 1984-01-11 | $7700.00 | Window Closed / Lapsed |