US4902099A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trace element spectrometry with plasma source
Assignee: Hitachi Ltd
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Filing: 1988-12-16
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Granted: 1990-02-20
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Expires: 2008-12-16
Abstract
Abstract A plasma trace element spectrometer comprises a microwave generator for generating microwave power, a microwave feeder for guiding and transforming the generated microwave power into microwave power of TE 01 mode and supplying the microwave power of TE 01 mode, a plasma producer having, at one end, an introduction port for a carrier gas and a sample and at the other end an opening and being cooperative with the supplied microwave power of TE 01 mode to produce plasma of the carrier gas and sample introduced through the introduction port, and a spectrometer for analyzing constituent elements of the sample by measuring the produced plasma by way of the opening.
Inventors
- 👤 Yukio Okamoto
- 👤 Makoto Yasuda
- 👤 Seiichi Murayama
- 👤 Masataka Koga
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:16
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/73
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
110 words
A plasma trace element spectrometer comprising: microwave generation means for generating microwave power; microwave feed means for guiding and transforming the generated microwave power into microwave power of TE 01 mode and supplying the microwave power of TE 01 mode; plasma production means having, at one end, an introduction port for a carrier gas and a sample and at the other end an opening and being cooperative with the supplied microwave power of TE 01 mode to produce plasma of the carrier gas and sample introduced through said introduction port; and spectrometer means for analyzing constituent elements of said sample by measuring the produced plasma by way of said opening.
Claim 2
Dependent Claim
110 words
A plasma trace element spectrometer comprising: microwave generation means for generating microwave power; microwave feed means for guiding and transforming the generated microwave power into microwave power of TE 01 mode and supplying the microwave power of TE 01 mode; plasma production means having, at one end, an introduction port for a carrier gas and a sample and at the other end an opening and being cooperative with the supplied microwave power of TE 01 mode to produce plasma of the carrier gas and sample introduced through said introduction port; and spectrometer means for analyzing constituent elements of said sample by measuring the produced plasma by way of said opening.
Claim 3
Dependent Claim
18 words
A plasma trace element spectrometer according to claim 1 wherein said microwave feed means comprises a microwave antenna.
Claim 4
Dependent Claim
17 words
A plasma trace element spectrometer according to claim 1 wherein said plasma is produced at atmospheric pressure.
Claim 5
Dependent Claim
17 words
A plasma trace element spectrometer according to claim 2 wherein said plasma is produced at atmospheric pressure.
Claim 6
Dependent Claim
19 words
A plasma trace element spectrometer according to claim 1 wherein said plasma generation means comprises magnetic field applying means.
Claim 7
Dependent Claim
19 words
A plasma trace element spectrometer according to claim 2 wherein said plasma generation means comprises magnetic field applying means.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-19 | 1993-08-21 | 1994-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-19 | 1997-08-21 | 1998-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-19 | 2001-08-21 | 2002-02-20 | $7700.00 | Window Closed / Lapsed |