US4009998A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acid concentration measurement
Assignee: Applied Automation Inc
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Filing: 1975-09-05
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Granted: 1977-03-01
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Expires: 1995-09-05
Abstract
Abstract The acid concentration of a test material is measured by passing a stream of water through a mixing device at a predetermined rate, adding a predetermined volume of the test material to the water upstream of the mixing device, and measuring the electrical conductivity of the mixed effluent stream from the mixing device.
Inventors
- 👤 L. V. Benningfield, Jr.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:23
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/06; G01N27/08; G01N27/10; Y; Y10; Y10S; Y10S436/00; Y10S436/824; Y10T; Y10T436/00; Y10T436/11; Y10T436/117497; Y10T436/15
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
The method of measuring the concentration of hydrofluoric acid in a test material which contains hydrofluoric acid, acid-soluble oils and light paraffins, which method comprises passing through a mixing device at a predetermined rate a first stream of water containing a water-miscible solvent capable of dissolving the hydrocarbons present in the test material, introducing a predetermined volume of said test material into said first stream upstream from said mixing device, and measuring the electrical conductivity of the resulting mixed effluent stream from said mixing device.
Claim 2
Independent Claim
85 words
The method of measuring the concentration of hydrofluoric acid in a test material which contains hydrofluoric acid, acid-soluble oils and light paraffins, which method comprises passing through a mixing device at a predetermined rate a first stream of water containing a water-miscible solvent capable of dissolving the hydrocarbons present in the test material, introducing a predetermined volume of said test material into said first stream upstream from said mixing device, and measuring the electrical conductivity of the resulting mixed effluent stream from said mixing device.
Claim 3
Dependent Claim
51 words
The method of claim 1 wherein the amount of said test material added to said first stream is such that said hydrofluoric acid is present in said effluent stream in a concentration range wherein the electrical conductivity of said effluent stream is substantially a linear function of the acid concentration therein.
Claim 4
Dependent Claim
10 words
The method of claim 1 wherein said solvent is tetrahydrofuran.
Claim 5
Dependent Claim
18 words
The method of claim 3 wherein said first stream comprises approximately 50 percent water and 50 percent tetrahydrofuran.
Claim 6
Dependent Claim
11 words
The method of claim 1 wherein said solvent is isopropyl alcohol.
Claim 7
Dependent Claim
19 words
The method of claim 5 wherein said first stream comprises approximately 50 percent water and 50 percent isopropyl alcohol.
References Cited (Backward Citations)
US2559090A
Cited
US2977199A
Cited
US3468637A
Cited
US3531252A
Cited
US3466228A
Cited
US3904365A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-02-29 | 1980-08-30 | 1981-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-02-29 | 1984-08-30 | 1985-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-02-29 | 1988-08-30 | 1989-03-01 | $7700.00 | Window Closed / Lapsed |