US3715581A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rapid scanning double focusing mass spectrograph
Assignee: Jeol Ltd
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Filing: 1970-06-15
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Granted: 1973-02-06
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Expires: 1990-06-15
Abstract
Abstract A rapid scanning double focusing mass spectrograph having a source of ions, means for producing a toroidal electric field, means for producing a homogeneous magnetic field and means for producing an r 1 magnetic field, wherein the r 1 magnetic field and the homogeneous magnetic field are excited simultaneously with a single energizing magnet and upper and lower parallel pole pieces of the means for producing a homogeneous magnetic field are secured to the rear ends of the upper and lower conical pole pieces of the means for producing an r 1 magnetic field with the curvature radii of the two means being kept equal.
Inventors
- 👤 H Matsuda
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 01:43
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/28; H01J49/32
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
119 words
In a rapid scanning double focusing mass spectrograph having an ion source, two focusing means and a dispersing means wherein an ion beam passes through a first focusing means to a dispersing means and then through a second focusing means prior to impingement upon a detector, the improvement comprising: A. a means for producing a dispersing field and a second focusing field in which the curvature of radii are equal; said dispersing field being an r 1 magnetic field and said second focusing field being an homogeneous magnetic field; and, B. a means comprising a common electromagnetic core for exciting both fields simultaneously over a range of intensities such that the intensity ratio between both fields is maintained constant.
Claim 2
Dependent Claim
119 words
In a rapid scanning double focusing mass spectrograph having an ion source, two focusing means and a dispersing means wherein an ion beam passes through a first focusing means to a dispersing means and then through a second focusing means prior to impingement upon a detector, the improvement comprising: A. a means for producing a dispersing field and a second focusing field in which the curvature of radii are equal; said dispersing field being an r 1 magnetic field and said second focusing field being an homogeneous magnetic field; and, B. a means comprising a common electromagnetic core for exciting both fields simultaneously over a range of intensities such that the intensity ratio between both fields is maintained constant.
Claim 3
Dependent Claim
119 words
In a rapid scanning double focusing mass spectrograph having an ion source, two focusing means and a dispersing means wherein an ion beam passes through a first focusing means to a dispersing means and then through a second focusing means prior to impingement upon a detector, the improvement comprising: A. a means for producing a dispersing field and a second focusing field in which the curvature of radii are equal; said dispersing field being an r 1 magnetic field and said second focusing field being an homogeneous magnetic field; and, B. a means comprising a common electromagnetic core for exciting both fields simultaneously over a range of intensities such that the intensity ratio between both fields is maintained constant.
Claim 4
Dependent Claim
119 words
In a rapid scanning double focusing mass spectrograph having an ion source, two focusing means and a dispersing means wherein an ion beam passes through a first focusing means to a dispersing means and then through a second focusing means prior to impingement upon a detector, the improvement comprising: A. a means for producing a dispersing field and a second focusing field in which the curvature of radii are equal; said dispersing field being an r 1 magnetic field and said second focusing field being an homogeneous magnetic field; and, B. a means comprising a common electromagnetic core for exciting both fields simultaneously over a range of intensities such that the intensity ratio between both fields is maintained constant.
Claim 5
Dependent Claim
72 words
The improvement set forth in claim 1 wherein the means for producing the dispersing field, r 1 magnetic field, comprise upper and lower confronting conical pole pieces symmetrically arranged about the ion beam orbit plane, said pole pieces having projection lines that intersect on the orbit plane and vertical axis of the r 1 and homogeneous magnetic fields, the centers of said pole pieces lying above and below the central ion beam.
Claim 6
Dependent Claim
40 words
The improvement set forth in claim 2 wherein said means for producing the second focusing field, homogeneous magnetic field, comprise upper and lower parallel pole pieces, the centers of said pole pieces lying above and below the central ion beam.
Claim 7
Dependent Claim
23 words
The improvement set forth in claim 3 wherein the upper pole pieces are joined together and the lower pole pieces are joined together.
Claim 8
Dependent Claim
25 words
The improvement set forth in claim 3 wherein the gap between the upper and lower pole pieces is adapted to vertical adjustment by adjusting means.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-06 | 1976-08-07 | 1977-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-06 | 1980-08-07 | 1981-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-06 | 1984-08-07 | 1985-02-06 | $7700.00 | Window Closed / Lapsed |