US5157260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for focusing ions in viscous flow jet expansion region of an electrospray apparatus
Assignee: Thermo Finnigan LLC
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Filing: 1991-05-17
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Granted: 1992-10-20
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Expires: 2011-05-17
Abstract
Abstract An electrospray ion source having a capillary tube for directing ions from an ionizing region to an analyzing region where it forms a gas jet with ions which expands and a tube lens cooperating with said capillary for forcing ions to the center of said jet.
Inventors
- 👤 Iain C. Mylchreest
- 👤 Mark E. Hail
- 👤 John R. Herron
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 20:37
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/04; H01J49/0404; G; G01; G01N; G01N30/00; G01N30/02; G01N30/62; G01N30/72; G01N30/7233; G01N30/724; G01N30/7266; G01N30/7293; H01J49/06; H01J49/067; G01N30/7246; G01N30/7273
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
111 words
In an ion source of the type which includes an ionization chamber and an adjacent low pressure region including a skimmer having an orifice, a capillary tube having an axial bore communicating between the ionization chamber and the lower pressure region whereby ions and gases in said ionization chamber flow through said bore into said low pressure region and undergo jet flow expansion, the improvement comprising providing a conductive tube lens in the low pressure chamber in cooperative relationship with the capillary tube and applying a voltage to said tube lens to force ions in said jet flow to the center of the jet where they are captured by the skimmer.
Claim 2
Dependent Claim
111 words
In an ion source of the type which includes an ionization chamber and an adjacent low pressure region including a skimmer having an orifice, a capillary tube having an axial bore communicating between the ionization chamber and the lower pressure region whereby ions and gases in said ionization chamber flow through said bore into said low pressure region and undergo jet flow expansion, the improvement comprising providing a conductive tube lens in the low pressure chamber in cooperative relationship with the capillary tube and applying a voltage to said tube lens to force ions in said jet flow to the center of the jet where they are captured by the skimmer.
Claim 3
Dependent Claim
21 words
An ion source as in claim 1 in which said ionization chamber includes means for electrospraying a sample to be analyzed.
Claim 4
Dependent Claim
13 words
An ion source as in claim 1 in which the lens is perforated.
Claim 5
Dependent Claim
13 words
An ion source as in claim 1 in which the lens is solid.
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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) | 1995-10-20 | 1996-04-20 | 1996-10-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-20 | 2000-04-20 | 2000-10-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-20 | 2004-04-20 | 2004-10-20 | $7700.00 | Window Closed / Lapsed |