US3824016A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined sample collection and vaporization system for spectro-chemical analysis
Assignee: Individual
•
Filing: 1972-06-16
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Granted: 1974-07-16
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Expires: 1992-06-16
Abstract
Abstract A porous spectroscopic sample holder is used for collection of a trace element in a fluid medium and the trace element is then vaporized directly from the sample holder. Measurement of the trace element is preferably accomplished by a nonflame atomic absorption method through electrothermal atomization.
Inventors
- 👤 J Lech
- 👤 R Woodriff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:30
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/74
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
83 words
A method for determining the amount of a trace element in a fluid medium comprising the steps of passing the fluid medium through a non-volatile solid filter composed of relatively inert microporous material so that the trace element from the medium is collected by the filter, furnace-heating said filter in an inert atmosphere to vaporize the collected trace element without significant volatilization of said filter material, and measuring the amount of said vaporized trace element by non-flame atomic spectro-chemical analysis employing electrothermal atomization.
Claim 2
Independent Claim
83 words
A method for determining the amount of a trace element in a fluid medium comprising the steps of passing the fluid medium through a non-volatile solid filter composed of relatively inert microporous material so that the trace element from the medium is collected by the filter, furnace-heating said filter in an inert atmosphere to vaporize the collected trace element without significant volatilization of said filter material, and measuring the amount of said vaporized trace element by non-flame atomic spectro-chemical analysis employing electrothermal atomization.
Claim 3
Dependent Claim
27 words
The method of claim 1 wherein said filter is cup-shaped and the trace element from the fluid medium is collected on the inside of the filter cup.
Claim 4
Dependent Claim
25 words
The method of claim 1 wherein the microporous material of said filter is selected from the group consisting of graphite, tantalum, iridium, zirconia and thoria.
Claim 5
Dependent Claim
10 words
The method of claim 1 wherein said material is graphite.
Claim 6
Dependent Claim
16 words
The method of claim 1 wherein said method measures the absorption of the vaporized trace element.
Claim 7
Dependent Claim
80 words
The method of claim 1 wherein said passing of the fluid medium through the filter comprises the steps of containing said filter in a chamber of a holder made of an inert material to prevent contamination, said holder completely enclosing the filter except for an inlet and outlet port communicating with said chamber and forcing said medium into said inlet port while exhausting said chamber through said outlet port to pass a predetermined quantity of said medium through the filter.
Claim 8
Dependent Claim
25 words
The method of claim 1 wherein said medium is air and said trace element is in the form of lead particulates suspended or dissolved therein.
Claim 9
Dependent Claim
72 words
Apparatus for determining the amount of a trace element in a fluid medium by spectro-chemical analysis, comprising a solid filter for collecting the trace element, said filter being composed of a non-volatile relatively inert microporous material, a furnace including said filter for vaporizing the collected trace element directly from said filter without significant volatilization of said microporous material, and means for spectroscopially measuring the emission or absorption of said vaporized trace element.
Claim 10
Dependent Claim
72 words
Apparatus for determining the amount of a trace element in a fluid medium by spectro-chemical analysis, comprising a solid filter for collecting the trace element, said filter being composed of a non-volatile relatively inert microporous material, a furnace including said filter for vaporizing the collected trace element directly from said filter without significant volatilization of said microporous material, and means for spectroscopially measuring the emission or absorption of said vaporized trace element.
Claim 11
Dependent Claim
25 words
The apparatus of claim 8 wherein the microporous material of said filter is selected from the group consisting of graphite, tantalum, iridium, zirconia and thoria.
Claim 12
Dependent Claim
21 words
The apparatus of claim 8 wherein said microporous material is graphite with a mean pore diameter no greater than 100 microns.
Claim 13
Dependent Claim
21 words
The apparatus of claim 8 further comprising means for passing said medium through said filter for collection of said trace element.
Claim 14
Dependent Claim
54 words
The apparatus of claim 11 wherein said means comprises a filter enclosure having a chamber for containing said filter, and inlet and outlet ports communicating with said chamber, and means for introducing a predetermined quantity of said medium into said chamber through said inlet port while exhausting said medium therefrom through said outlet port.
Claim 15
Dependent Claim
17 words
The apparatus of claim 12 wherein said introducing means comprises a syringe connected to said outlet port.
Claim 16
Dependent Claim
10 words
THe apparatus of claim 8 wherein said filter is cup-shaped.
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) | 1977-07-15 | 1978-01-14 | 1978-07-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-15 | 1982-01-14 | 1982-07-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-15 | 1986-01-14 | 1986-07-16 | $7700.00 | Window Closed / Lapsed |