US4595831A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multiple mass range triple collector spectrometer
Assignee: Mobil Oil AS
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Filing: 1983-11-09
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Granted: 1986-06-17
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Expires: 2003-11-09
Abstract
Abstract The mass spectrometer has multiple collectors for measuring the intensity of ion beams and a resolving plate having a plurality of aperture clusters. The plate is rotated to selectively position one of the aperture clusters between the beams and the collectors. The apertures in each cluster have separations which allow beams of predetermined ion mass to impinge upon the collectors.
Inventors
- 👤 Ernest A. Hetherington, Jr.
- 👤 Cecil M. Orr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:17
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
100 words
A mass spectrometer comprising: a source of ions emanating from a sample; means for separating beams of said ions according to mass; multiple collectors for measuring the intensity of said beams; a resolving plate having a plurality of aperture clusters, the clusters having apertures with different separations which allow beams of different predetermined ion mass to pass through to impinge upon said collectors; and a shaft, said resolving plate being rotatable on said shaft to selectively position one of said aperture clusters between said beams and said collectors with each aperture in the cluster corresponding with one of said collectors.
Claim 2
Dependent Claim
100 words
A mass spectrometer comprising: a source of ions emanating from a sample; means for separating beams of said ions according to mass; multiple collectors for measuring the intensity of said beams; a resolving plate having a plurality of aperture clusters, the clusters having apertures with different separations which allow beams of different predetermined ion mass to pass through to impinge upon said collectors; and a shaft, said resolving plate being rotatable on said shaft to selectively position one of said aperture clusters between said beams and said collectors with each aperture in the cluster corresponding with one of said collectors.
Claim 3
Dependent Claim
34 words
The mass spectrometer recited in claim 1 wherein the apertures in each cluster on said resolving plate are at different distances from said source to accommodate different focal points of said beams on ions.
Claim 4
Dependent Claim
49 words
The mass spectrometer recited in claim 2 wherein said resolving plate is a rotatable disk having circumferential segments which are at different distances from said source of ions, the different apertures of each cluster being in different circumferential segments to accommodate different focal points of said beams of ions.
Claim 5
Dependent Claim
102 words
A mass spectrometer comprising: a source of ions emanating from a sample; means for separating beams of ions according to mass; multiple Faraday collectors for measuring the intensity of said beams; a resolving plate having a plurality of aperture clusters, each cluster having slits with different separations which allow beams of predetermined ion mass to pass through to impinge upon said collectors; and means for changing the relative positions between said resolving plate and said collectors to selectively position one of said aperture clusters between said beams and said collectors with each aperture in the cluster corresponding with one of said collectors.
Claim 6
Dependent Claim
102 words
A mass spectrometer comprising: a source of ions emanating from a sample; means for separating beams of ions according to mass; multiple Faraday collectors for measuring the intensity of said beams; a resolving plate having a plurality of aperture clusters, each cluster having slits with different separations which allow beams of predetermined ion mass to pass through to impinge upon said collectors; and means for changing the relative positions between said resolving plate and said collectors to selectively position one of said aperture clusters between said beams and said collectors with each aperture in the cluster corresponding with one of said collectors.
Claim 7
Dependent Claim
31 words
The mass spectrometer recited in claim 4 wherein said Faraday collectors comprise: a narrow width central Faraday cup and Faraday cups of wider width on both sides of said central cup.
Claim 8
Dependent Claim
53 words
The mass spectrometer recited in claim 5 wherein each cluster includes: at least a central slit which is selectively positioned over said narrow width central Faraday cups; and slits at predetermined distances from said central slit and selectively positioned over said cups of wider width wherein said wider width accommodates said different distances.
Claim 9
Dependent Claim
52 words
The mass spectrometer recited in claim 6 wherein said resolving plate has a central shaft on which it is rotatable to selectively position said clusters over said collectors, said central slits being at the same radial distance about said shaft and the other slits being at different radial distances about said shaft.
Claim 10
Dependent Claim
30 words
The mass spectrometer recited in claim 1 or claim 4 wherein said collectors are at different distances from said source to accommodate different focal points of said beams of ions.
References Cited (Backward Citations)
US3786249A
Cited
US4031397A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-06-16 | 1989-12-16 | 1990-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-06-16 | 1993-12-16 | 1994-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-06-16 | 1997-12-16 | 1998-06-17 | $7700.00 | Window Closed / Lapsed |