Patent US3307033A successfully refreshed from Google Patents.
US3307033A
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Coincidence mass spectrometer with electrostatic means to separate positive and negative ions and detectors and method of use
Assignee: WILLIAM H JOHNSTON LAB Inc
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Filing: 1963-07-19
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Granted: 1967-02-28
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Expires: 1983-07-19
Abstract
No abstract record available.
Inventors
- 👤 Marvin L Vestal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:21
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; H01J49/34; H01J49/40; H01J49/0095
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
125 words
THE METHOD OF INVESTIGATING AN IONIZATION PROCESS WHICH COMPRISES DIRECTING AN IONIZING BEAM UPON A PREDETERMINED VOLUME OF A SAMPLE TO IONIZE MOLECULES AND NEGATIVE FORM ION-PAIRS COMPOSED OF POSITIVE AND NEGATIVE IONS, SUBJECTING THE ION-PAIRS TO AN ELECTRIC FIELD TO URGE THE POSITIVE AND NEGATIVE IONS THEREOF IN DIFFERENT DIRECTIONS TOWARD RESPECTIVELY POSITIVE AND NEGATIVE ION DETECTORS, SEPARATELY DETECTING THE POSITIVE AND NEGATIVE IONS OF EACH ION-PAIR RECEIVED FROM THE SAID VOLUME IN ACCORDANCE WITH THE DIFFERENCE IN TRANSIT TIMES THEREOF BETWEEN THE SAID VOLUME AND THE ION DETECTORS, AND ALLOWING POSITIVE IONS TO REACH THE POSITIVE ION DETECTOR ONLY DURING A SHORT TIME INTERVAL FOLLOWING DETECTION OF EACH NEGATIVE ION, SUCH TIME INTERVAL BEING NOT SUBSTANTIALLY LONGER THAN SUCH DIFFERENCE IN TRANSIT TIMES.
Claim 2
Independent Claim
125 words
THE METHOD OF INVESTIGATING AN IONIZATION PROCESS WHICH COMPRISES DIRECTING AN IONIZING BEAM UPON A PREDETERMINED VOLUME OF A SAMPLE TO IONIZE MOLECULES AND NEGATIVE FORM ION-PAIRS COMPOSED OF POSITIVE AND NEGATIVE IONS, SUBJECTING THE ION-PAIRS TO AN ELECTRIC FIELD TO URGE THE POSITIVE AND NEGATIVE IONS THEREOF IN DIFFERENT DIRECTIONS TOWARD RESPECTIVELY POSITIVE AND NEGATIVE ION DETECTORS, SEPARATELY DETECTING THE POSITIVE AND NEGATIVE IONS OF EACH ION-PAIR RECEIVED FROM THE SAID VOLUME IN ACCORDANCE WITH THE DIFFERENCE IN TRANSIT TIMES THEREOF BETWEEN THE SAID VOLUME AND THE ION DETECTORS, AND ALLOWING POSITIVE IONS TO REACH THE POSITIVE ION DETECTOR ONLY DURING A SHORT TIME INTERVAL FOLLOWING DETECTION OF EACH NEGATIVE ION, SUCH TIME INTERVAL BEING NOT SUBSTANTIALLY LONGER THAN SUCH DIFFERENCE IN TRANSIT TIMES.
Claim 3
Dependent Claim
155 words
APPARATUS FOR INVESTIGATING THE IONIZATION OF A SAMPLE WHICH COMPRISES AN IONIZING BEAM SOURCE OPERABLE TO DIRECT ITS BEAM UPON SAID SAMPLE, MEANS FORMING AN ELECTRIC FIELD ADJACENT THE REGION OF IONIZATION FOR URGING THE POSITIVE AND NEGATIVE IONS OF EACH ION-PAIR FORMED BY THE IONIZING BEAM IN DIFFERENT DIRECTIONS AWAY FROM SAID REGION, MEANS INCLUDING SEPARATE POSITIVE AND NEGATIVE ION DETECTORS SPACED APART IN SAID DIFFERENT DIRECTIONS FROM SAID REGION, SAID MEANS BEING OPERABLE TO FURNISH A RESPONSE TO FORMATION OF IONS OF A PARTICULAR MASS IN A VOLUME FROM THE DIFFERENCE IN TRANSIT TIMES OF THE POSITIVE AND NEGATIVE IONS FORMED WITH MOLECULES OF THAT MASS, BETWEEN SAID VOLUME AND THE RESPECTIVE DETECTORS, AND MEANS CONNECTED TO SAID NEGATIVE ION DETECTOR FORF ALLOWING POSITIVE IONS TO REACH SAID POSITIVE ION DETECTOR ONLY DURING A SHORT TIME INTERVAL NOT SUBSTANTIALLY LARGER THAN SAID DIFFERENCE IN TRANSIT TIMES, AFTER EACH DETECTION OF A NEGATIVE ION.
Claim 4
Dependent Claim
155 words
APPARATUS FOR INVESTIGATING THE IONIZATION OF A SAMPLE WHICH COMPRISES AN IONIZING BEAM SOURCE OPERABLE TO DIRECT ITS BEAM UPON SAID SAMPLE, MEANS FORMING AN ELECTRIC FIELD ADJACENT THE REGION OF IONIZATION FOR URGING THE POSITIVE AND NEGATIVE IONS OF EACH ION-PAIR FORMED BY THE IONIZING BEAM IN DIFFERENT DIRECTIONS AWAY FROM SAID REGION, MEANS INCLUDING SEPARATE POSITIVE AND NEGATIVE ION DETECTORS SPACED APART IN SAID DIFFERENT DIRECTIONS FROM SAID REGION, SAID MEANS BEING OPERABLE TO FURNISH A RESPONSE TO FORMATION OF IONS OF A PARTICULAR MASS IN A VOLUME FROM THE DIFFERENCE IN TRANSIT TIMES OF THE POSITIVE AND NEGATIVE IONS FORMED WITH MOLECULES OF THAT MASS, BETWEEN SAID VOLUME AND THE RESPECTIVE DETECTORS, AND MEANS CONNECTED TO SAID NEGATIVE ION DETECTOR FORF ALLOWING POSITIVE IONS TO REACH SAID POSITIVE ION DETECTOR ONLY DURING A SHORT TIME INTERVAL NOT SUBSTANTIALLY LARGER THAN SAID DIFFERENCE IN TRANSIT TIMES, AFTER EACH DETECTION OF A NEGATIVE ION.
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) | 1970-02-27 | 1970-08-29 | 1971-02-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-02-27 | 1974-08-29 | 1975-02-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-02-27 | 1978-08-29 | 1979-02-28 | $7700.00 | Window Closed / Lapsed |