US3957374A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for obtaining samples of dusts for analysis by spectrochemical examination
Assignee: Carl Zeiss AG
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Filing: 1975-01-14
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Granted: 1976-05-18
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Expires: 1995-01-14
Abstract
Abstract Samples of fine dusts in air or gases are collected for analysis and measurement by atomic absorption or atomic fluorescence by conducting the air or gases across a surface of a sample container and causing the dust to be deposited electrostatically on the said surface. The sample container is then heated to a temperature sufficient to vaporize the particles of dust, and the vaporized particles are then brought into the beam path of an atomic absorption or atomic fluorescence spectrometer.
Inventors
- 👤 Manfred Kriese
- 👤 Jurgen Kuhl
- 👤 Siegfried Neumann
- 👤 Reimund Torge
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 17:18
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/74
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
133 words
Apparatus for obtaining samples of dusts for analysis by spectrochemical examination comprising a sample container, an ion generator for electrostatically charging dust particles contained in air adjacent the surface of said sample container, means for electrostatically charging the sample container positively, means for electrostatically charging the ion generator negatively, means including a circuit for heating said sample container electrically, and a double-throw switch for connecting said sample container either to a source of high voltage electric current for electrostatically depositing the dust particles on said sample container or alternatively to said heating circuit for atomizing the deposited dust particles, said ion generator being mounted on a swivel device which allows the ion generator to swing away to expose said sample container to a light source for spectrochemical examination of said atomized dust particles.
Claim 2
Dependent Claim
133 words
Apparatus for obtaining samples of dusts for analysis by spectrochemical examination comprising a sample container, an ion generator for electrostatically charging dust particles contained in air adjacent the surface of said sample container, means for electrostatically charging the sample container positively, means for electrostatically charging the ion generator negatively, means including a circuit for heating said sample container electrically, and a double-throw switch for connecting said sample container either to a source of high voltage electric current for electrostatically depositing the dust particles on said sample container or alternatively to said heating circuit for atomizing the deposited dust particles, said ion generator being mounted on a swivel device which allows the ion generator to swing away to expose said sample container to a light source for spectrochemical examination of said atomized dust particles.
Claim 3
Dependent Claim
30 words
Apparatus as claimed in claim 1 in which said sample container comprises a graphite bar and in which said ion generator comprises a corona discharge electrode located above said bar.
Claim 4
Dependent Claim
28 words
Apparatus as claimed in claim 1 in which said swivel device is actuated by electromagnetic means including a circuit which is energized when said heating curcuit is energized.
References Cited (Backward Citations)
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US3419359A
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US3702219A
Cited
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Cited
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Cited
US3873205A
Cited
US3879986A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-05-18 | 1979-11-17 | 1980-05-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-05-18 | 1983-11-17 | 1984-05-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-05-18 | 1987-11-17 | 1988-05-18 | $7700.00 | Window Closed / Lapsed |