US3555273A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass filter apparatus having an electric field the equipotentials of which are three dimensionally hyperbolic
Assignee: Varian Medical Systems Inc
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Filing: 1968-07-18
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Granted: 1971-01-12
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Expires: 1988-07-18
Abstract
Abstract A mass filter apparatus for use in mass spectrometers and the like having an electrode structure capable of generating an electric field, the equipotentials of which are three dimensionally hyperbolic and thus avoid the prior art difficulties associated with discontinuities at the entrance and exit ends of the filter apparatus.
Inventors
- 👤 James T Arnold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:20
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/42; H01J49/4205; H01J49/421
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
49 words
A mass filter providing stable transit over its entire operating length for charged particles having a certain mass-tocharge ratio comprising: potential supporting electrode means for creating within a given volume of space an electric field the instantaneous equipotentials phi of which are described by an equation of the form
Claim 2
Dependent Claim
49 words
A mass filter providing stable transit over its entire operating length for charged particles having a certain mass-tocharge ratio comprising: potential supporting electrode means for creating within a given volume of space an electric field the instantaneous equipotentials phi of which are described by an equation of the form
Claim 3
Dependent Claim
32 words
A mass filter as defined in claim 1 wherein said electrode means includes a first electrode the surface of which is in the shape of an elliptical hyperboloid defined by the equation
Claim 4
Dependent Claim
18 words
A mass filter as defined in claim 2 wherein said entrance aperture passes through said first electrode at
Claim 5
Dependent Claim
20 words
A mass filter as defined in claim 3 wherein said potentials applIed to said electrode means are of the form
Claim 6
Dependent Claim
69 words
A mass filter as defined in claim 1 wherein said electrode means are comprised of a plurality of elliptical rings disposed relative to each other in a manner so as to lie on the surfaces of a pair of imaginary right elliptical cones positioned base to base, the axes of said cones being coincident with the y axis, and said rings lying in planes parallel to the x-z plane.
Claim 7
Dependent Claim
38 words
A mass filter as defined in claim 5 wherein said rings are functionally simulated by the truncated boundaries of a plurality of concentrically disposed elliptical cylinders, said truncated boundaries being contiguous with the surface of said imaginary cones.
Claim 8
Dependent Claim
29 words
A mass filter as defined in claim 5 wherein said elliptical rings are uniformly spaced about the y-axis and the potential applied to said rings is of the form
Claim 9
Dependent Claim
86 words
A mass spectrometer for analyzing charged particles comprising: a source of charged particles; a collector means for collecting certain ones of said charged particles; and a mass filter separating said source and said collector means and having an entrance aperture adjacent said source and an exit aperture adjacent said collector means, said mass filter further including potential supporting electrode means for creating within a given volume of space defined by said electrode means an electric field the instantaneous equipotentials of which are defined by the equation
Claim 10
Dependent Claim
86 words
A mass spectrometer for analyzing charged particles comprising: a source of charged particles; a collector means for collecting certain ones of said charged particles; and a mass filter separating said source and said collector means and having an entrance aperture adjacent said source and an exit aperture adjacent said collector means, said mass filter further including potential supporting electrode means for creating within a given volume of space defined by said electrode means an electric field the instantaneous equipotentials of which are defined by the equation
Claim 11
Dependent Claim
66 words
A mass spectrometer as defined in claim 8 wherein electrode means are comprised of a plurality of elliptical rings disposed relative to each other in a manner so as to lie on the surfaces of a pair of imaginary elliptical cones positioned base to base, the axis of said cones being coincident with the y-axis, and said rings lying in planes parallel to the x-z plane.
Claim 12
Dependent Claim
37 words
A mass spectrometer as defined in claim 9 wherein said rings are functionally simulated by the truncated boundaries of a plurality of concentrically disposed elliptical cylinders, said boundaries being contiguous with the surface of said imaginary cones.
Claim 13
Dependent Claim
29 words
A mass spectrometer as defined in claim 9 wherein said elliptical rings are uniformly spaced about the y-axis and the potential applied to said rings is of the form
References Cited (Backward Citations)
US3457404A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |