US4296322A
Expired / Lapsed
US
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Method for analyzing organic substances
Assignee: Balzers und Leybold Deutschland Holding AG
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Filing: 1979-08-27
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Granted: 1981-10-20
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Expires: 1999-08-27
Abstract
Abstract Organic substances, particularly those derived from a chromatograph, are analyzed by subjecting such a substance to laser radiation to produce negative ions of the substance, and by subjecting those negative ions to mass spectrometry, preferably time-of-flight mass spectrometry.
Inventors
- 👤 Reiner Wechsung
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 04:11
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/10; H01J49/16; H01J49/161; H01J49/164; G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/72; G01N30/7233; G01N30/728; G01N30/7286
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
34 words
A method for analyzing high molecular weight organic substances exiting from a chromatograph comprising subjecting such substance to laser radiation to produce negative ions therefrom, and subjecting those negative ions to time-of-flight mass spectroscopy.
Claim 2
Independent Claim
34 words
A method for analyzing high molecular weight organic substances exiting from a chromatograph comprising subjecting such substance to laser radiation to produce negative ions therefrom, and subjecting those negative ions to time-of-flight mass spectroscopy.
Claim 3
Dependent Claim
117 words
A method as defined in claim 1 wherein said step of subjecting such substance to laser radiation is carried out by delivering the substance from a chromatograph into a vacuum chamber, and focussing pulses of laser light from a laser onto the substance in the chamber to produce the negative ions, and said step of subjecting those negative ions to mass spectroscopy is carried out by disposing the time-of-flight tube of a time-of-flight mass spectrometer in the vacuum chamber and producing a positive potential with respect to the negative ions by means of an electrode disposed in the vacuum chamber at a location to attract the negative ions produced by the laser light into the time-of-flight tube.
Claim 4
Dependent Claim
33 words
A method as defined in claim 2 wherein said step of introducing the substance into the vacuum chamber is carried out conveying the substance on a transporting belt extending into the vacuum chamber.
Claim 5
Dependent Claim
20 words
A method as defined in claim 1 wherein the organic substances have mass numbers equal to or greater than 200.
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) | 1984-10-19 | 1985-04-20 | 1985-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-10-19 | 1989-04-20 | 1989-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-10-19 | 1993-04-20 | 1993-10-20 | $7700.00 | Window Closed / Lapsed |