Patent US3629573A successfully refreshed from Google Patents.
US3629573A
Expired / Lapsed
US
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Monopole/quadrupole mass spectrometer
Assignee: Bendix Corp
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Filing: 1970-08-20
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Granted: 1971-12-21
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Expires: 1990-08-20
Abstract
Abstract This invention combines an auxiliary apertured electrode with a quadrupole type mass filter. The assembly comprises a quadrupole arrangement with at least one of the poles of the filter extending beyond the others. Beneath the extended electrode is a V-shaped electrode having an aperture therein for the passage of ions. The extended rod and the V-shaped electrode forms a monopole configuration so that ions to be analyzed are introduced through the aperture in the V-shaped electrode and into the analyzing region at an angle to the central axis (Z-axis) of the quadrupole structure thereby reducing the effect of the fringing field.
Inventors
- 👤 John P Carrico
- 👤 Patrick F Mcginnis
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:03
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/42; H01J49/4205; H01J49/421; H01J49/4215
Claims Analysis
Total Claims: 17
Claim 1
Independent Claim
123 words
In combination with a mass filter of the type having four axially elongated electrodes having coextensive portions and arranged about a central axis for creating a time periodical electric field therebetween to separate ions having different mass-to-charge ratios by causing certain ions to perform oscillations of limited amplitudes and other ions to perform oscillations of increasing amplitudes depending on the mass-tocharge ratios of the ions, thereby separating certain ions from the others, the improvement comprising: an auxiliary electrode having an aperture therein for the passage of ions, said auxiliary electrode aligned with and adjacent to at least one of said elongated electRodes which extends beyond the other three so that ions passing through said auxiliary electrode aperture enter said time periodical electric field.
Claim 2
Dependent Claim
123 words
In combination with a mass filter of the type having four axially elongated electrodes having coextensive portions and arranged about a central axis for creating a time periodical electric field therebetween to separate ions having different mass-to-charge ratios by causing certain ions to perform oscillations of limited amplitudes and other ions to perform oscillations of increasing amplitudes depending on the mass-tocharge ratios of the ions, thereby separating certain ions from the others, the improvement comprising: an auxiliary electrode having an aperture therein for the passage of ions, said auxiliary electrode aligned with and adjacent to at least one of said elongated electRodes which extends beyond the other three so that ions passing through said auxiliary electrode aperture enter said time periodical electric field.
Claim 3
Dependent Claim
55 words
The combination as recited in claim 1 wherein said auxiliary electrode comprises: two axially elongated conductive and electrically interconnected surface members forming an angle with each other and extending along and in spaced relationship to said central axis between said elongated electrodes, said aperture therein extending along a portion of at least one surface member.
Claim 4
Dependent Claim
30 words
The combination as recited in claim 2 wherein said plurality of elongated electrodes arranged about the central axis for creating a time periodical electric field therebetween are cylindrically shaped electrodes.
Claim 5
Dependent Claim
17 words
The combination as recited in claim 2 wherein said auxiliary electrode includes a screen covering said aperture.
Claim 6
Dependent Claim
24 words
The combination as recited in claim 1 wherein said auxiliary electrode comprise a planar electrode having an aperture therein for the passage of ions.
Claim 7
Dependent Claim
95 words
In combination with a mass filter of the type having four axially elongated electrodes arranged about a central axis for creating a time periodical electric field therebetween to separate ions having different mass-to-charge ratios, the improvement wherein one of said electrodes extends beyond the ends of the other electrodes, and a fifth electrode having an aperture is disposed opposite the extended portion of said extended electrode on the side of said central axis so that ions may pass through the aperture in said fifth electrode and into said time periodical electric field between said electrodes.
Claim 8
Dependent Claim
95 words
In combination with a mass filter of the type having four axially elongated electrodes arranged about a central axis for creating a time periodical electric field therebetween to separate ions having different mass-to-charge ratios, the improvement wherein one of said electrodes extends beyond the ends of the other electrodes, and a fifth electrode having an aperture is disposed opposite the extended portion of said extended electrode on the side of said central axis so that ions may pass through the aperture in said fifth electrode and into said time periodical electric field between said electrodes.
Claim 9
Dependent Claim
55 words
The combination as recited in claim 6 wherein said fifth electrode comprises: two axially elongated conductive and electrically interconnected surface members forming an angle with each other and extending along and in spaced relationship to said central axis between said elongated electrodes, said aperture therein extending along a portion of at least one surface member.
Claim 10
Dependent Claim
20 words
The combination as recited in claim 7 wherein said elongated electrodes arranged about the central axis are cylindrically shaped electrodes.
Claim 11
Dependent Claim
17 words
The combination as recited in claim 6 wherein said auxiliary electrode includes a screen covering said aperture.
Claim 12
Independent Claim
184 words
An apparatus for separating ions having different mass-to-charge ratios, comprising: an evacuable enclosure; four axially elongated electrodes located within said evacuable enclosure and arranged about a central axis, one electrode extending beyond the other three; an auxiliary electrode having an aperture therein for the passage of ions, said auxiliary electrode disposed in parallel axial alignment with and adjacent to said one electrode extending beyond the other three on the side of the central axis; means for holding said electrodes in spaced relation; means for applying a voltage having a periodical function of time f(t) to said elongated electrodes to create a time periodical electric field therebetween; means for creating and introducing ions into said electric field through said aperture in said auxiliary electrode whereby said electric field causes certain ions to perform oscillations of limited amplitude and other ions to perform oscillations of increasing amplitude, depending upon the respective specific charges on the ions, thereby separating certain ions from others; and means for detecting said ions having oscillations of limited amplitude said detecting means disposed at one of the ends of said elongated electrodes.
Claim 13
Independent Claim
184 words
An apparatus for separating ions having different mass-to-charge ratios, comprising: an evacuable enclosure; four axially elongated electrodes located within said evacuable enclosure and arranged about a central axis, one electrode extending beyond the other three; an auxiliary electrode having an aperture therein for the passage of ions, said auxiliary electrode disposed in parallel axial alignment with and adjacent to said one electrode extending beyond the other three on the side of the central axis; means for holding said electrodes in spaced relation; means for applying a voltage having a periodical function of time f(t) to said elongated electrodes to create a time periodical electric field therebetween; means for creating and introducing ions into said electric field through said aperture in said auxiliary electrode whereby said electric field causes certain ions to perform oscillations of limited amplitude and other ions to perform oscillations of increasing amplitude, depending upon the respective specific charges on the ions, thereby separating certain ions from others; and means for detecting said ions having oscillations of limited amplitude said detecting means disposed at one of the ends of said elongated electrodes.
Claim 14
Dependent Claim
59 words
The apparatus as recited in claim 10 wherein said auxiliary electrode having an aperture therein comprises: two axially elongated conductive and electrically interconnected surface members forming an angle with each other and extending along and in spaced relationship to said central axis between said elongated electrodes, said aperture therein extending along a portion of at least one surface member.
Claim 15
Dependent Claim
71 words
The apparatus as recited In claim 10 wherein said detecting means includes: a second auxiliary electrode having an aperture therein for the passage of said ions having oscillations of limited amplitude, said second auxiliary electrode disposed in axial alignment with at least one of said elongated electrodes; and means for collecting ions passing through said second auxiliary electrode aperture, said collecting means disposed adjacent the central axis of said elongated electrodes.
Claim 16
Dependent Claim
71 words
The apparatus as recited in claim 11 wherein said detecting means includes: a second auxiliary electrode having an aperture therein for the passage of said ions having oscillations of limited amplitude, said second auxiliary electrode disposed in axial alignment with at least one of said elongated electrodes; and means for collecting ions passing through said second auxiliary electrode aperture, said collecting means disposed adjacent the central axis of said elongated electrodes.
Claim 17
Dependent Claim
24 words
The combination as recited in claim 10 wherein said auxiliary electrode comprises a planar electrode having an aperture therein for the passage of ions.
References Cited (Backward Citations)
US3555271A
Cited
US3560734A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-20 | 1975-06-21 | 1975-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-20 | 1979-06-21 | 1979-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-20 | 1983-06-21 | 1983-12-21 | $7700.00 | Window Closed / Lapsed |