US4055987A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid chromatograph/mass spectrometer interface
Assignee: Thermo Finnigan LLC
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Filing: 1976-03-04
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Granted: 1977-11-01
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Expires: 1996-03-04
Abstract
Abstract A liquid chromatograph/mass spectrometer interface for permitting the efficient and continuous introduction of an effluent solution from liquid chromatograph into a quadrupole mass spectrometer or any other vacuum analytical system includes a thin ribbon in the form of a loop which at one end receives liquid chromatograph effluent which is passed through one or more vacuum locks to remove residual solvent. At the other end the film of solute or low volatility sample is flash vaporized into the ionization chamber of the mass spectrometer. The interface device is also used to sample dilute solutions from any other source and can be used in a continuous mode, in a single sample mode, or for automatic but intermittent sample introduction.
Inventors
- 👤 William H. McFadden
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:19
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/04; H01J49/0431; H01J49/0468; H01J49/049; G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/72; G01N30/728; G01N30/7286
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
91 words
An interface for permitting efficient continuous introduction of any dilute solution into the ionization chamber, having an entrance port, of a mass spectrometer comprising: a thin ribbon in the form of a loop; driving means for continuous moving of said ribbon; means for receiving said solution and depositing it on said moving ribbon; a vaporization chamber including a turn-around for said loop in close proximity to said entrance port of said ionization chamber of said mass spectrometer and heating means for vaporizing said deposited solution for introduction into said ionization chamber.
Claim 2
Dependent Claim
91 words
An interface for permitting efficient continuous introduction of any dilute solution into the ionization chamber, having an entrance port, of a mass spectrometer comprising: a thin ribbon in the form of a loop; driving means for continuous moving of said ribbon; means for receiving said solution and depositing it on said moving ribbon; a vaporization chamber including a turn-around for said loop in close proximity to said entrance port of said ionization chamber of said mass spectrometer and heating means for vaporizing said deposited solution for introduction into said ionization chamber.
Claim 3
Dependent Claim
20 words
An interface as in claim 1 including at least one intermediate vacuum lock for pumping out solvent from said solution.
Claim 4
Dependent Claim
17 words
An interface as in claim 1 wherein said heating means is in close proximity to said turn-around.
Claim 5
Dependent Claim
17 words
An interface as in claim 1 where said dilute solution is the effluent from a liquid chromatograph.
Claim 6
Dependent Claim
41 words
An interface as in claim 1 where said turn-around includes a plurality of pins arranged in the form of an arc around which said loop is turned the center of curvature of said arc being in close proximity to said port.
Claim 7
Dependent Claim
126 words
An interface for permitting efficient continuous introduction of any dilute solution into the ionization chamber, having an entrance port, of a mass spectrometer comprising: a thin ribbon in the form of a loop; driving means for continuous moving of said ribbon; means for receiving said solution and depositing it on said moving ribbon; a vaporization chamber including a turn-around for said loop in close proximity to said entrance port of said ionization chamber of said mass spectrometer and heating means for vaporizing said deposited solution for introduction into said ionization chamber; first and second series connected vacuum locks connected directly to said mass spectrometer through which said loop is moved after said solution is deposited; and means for pumping out solvent from each of said locks.
Claim 8
Dependent Claim
126 words
An interface for permitting efficient continuous introduction of any dilute solution into the ionization chamber, having an entrance port, of a mass spectrometer comprising: a thin ribbon in the form of a loop; driving means for continuous moving of said ribbon; means for receiving said solution and depositing it on said moving ribbon; a vaporization chamber including a turn-around for said loop in close proximity to said entrance port of said ionization chamber of said mass spectrometer and heating means for vaporizing said deposited solution for introduction into said ionization chamber; first and second series connected vacuum locks connected directly to said mass spectrometer through which said loop is moved after said solution is deposited; and means for pumping out solvent from each of said locks.
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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) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |