US3685911A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capillary arc plasma source for and method of spectrochemical analysis
Assignee: APPLIED RES LAB
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Filing: 1968-06-17
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Granted: 1972-08-22
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Expires: 1988-06-17
Abstract
Abstract A wall-stabilized electric arc within a capillary tube, supported by a gas flowing lengthwise through the tube is used to excite a material for spectroscopic analysis. A material to be analyzed, in gaseous or finely comminuted form, is fed into the arc near one end and carried through it by the working gas. Emission or absorption of radiation is observed endwise of the tube.
Inventors
- 👤 Ralph L Dahlquist
- 👤 James L Jones
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:14
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/66; G01N21/67; G01N21/71; G01N21/73; H; H01; H01J; H01J37/00; H01J37/32
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
101 words
A capillary arc plasma device comprising: a. means defining a straight tubular passageway, b. means defining an anode at one end of said passageway, c. means electrically insulating said anode from a substantial lengthwise part of the inwardly facing surface that bounds said passageway, and d. a cathode adjacent to the end of said passageway opposite from said anode and radially offset from said passageway, said cathode being shielded from the anode end of the passageway to minimize transmission of light from the cathode through the passageway and enable end-on spectrometric observation of an arc in the passageway without excessive background.
Claim 2
Dependent Claim
101 words
A capillary arc plasma device comprising: a. means defining a straight tubular passageway, b. means defining an anode at one end of said passageway, c. means electrically insulating said anode from a substantial lengthwise part of the inwardly facing surface that bounds said passageway, and d. a cathode adjacent to the end of said passageway opposite from said anode and radially offset from said passageway, said cathode being shielded from the anode end of the passageway to minimize transmission of light from the cathode through the passageway and enable end-on spectrometric observation of an arc in the passageway without excessive background.
References Cited (Backward Citations)
US3458258A
Cited
US3512030A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-22 | 1976-02-21 | 1976-08-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-22 | 1980-02-21 | 1980-08-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-22 | 1984-02-21 | 1984-08-22 | $7700.00 | Window Closed / Lapsed |