US3265890A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mass spectrometer leak detector
Assignee: National Research Corp
•
Filing: 1963-12-20
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Granted: 1966-08-09
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Expires: 1983-12-20
Abstract
No abstract record available.
Inventors
- 👤 Walton E Briggs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:13
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/26; G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/20; G01M3/202; H01J49/02; H01J49/06; H01J49/10; H01J49/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
AN IMPROVEMENT IN MASS SPECTROMETER, APPARATUS COMPRISING A SERIES FLOW ARRANGEMENT OF AT LEAST ONE GAS FLOW INLET FOR CONNECTING THE APPARATUS TO A GAS SAMPLE SOURCE AND TO VACUUM PUMPING MEANS FOR THE SPECTROMETER APPARATUS, AN ELECTRICAL HORIZONTAL DEVICE OF THE COLD CATHODE DISCHARGE TYPE, AND A HOT FILAMENT ION SOURCE OF THE MASS SPECTROMETER AND MASS SPECTROMETER ANALYZER AND COLLECTOR MEANS, THE IMPROVEMENT WHEREIN THE COLD CATHODE DISCHARGE DEVICE IS ARRANGED IN SERIES BETWEEN ONE GAS FLOW INLET AND THE HOT FILAMENT ION SOURCE TO INTERCEPT AND PUMP A SUBSTANTIAL PORTION OF CARBONIZING GASSES ENTERING THE GAS FLOW INLET WHEREBY FILAMENT CONTAMINATION AND SENSITIVITY LOSS ARE LIMITED.
Claim 2
Dependent Claim
109 words
AN IMPROVEMENT IN MASS SPECTROMETER, APPARATUS COMPRISING A SERIES FLOW ARRANGEMENT OF AT LEAST ONE GAS FLOW INLET FOR CONNECTING THE APPARATUS TO A GAS SAMPLE SOURCE AND TO VACUUM PUMPING MEANS FOR THE SPECTROMETER APPARATUS, AN ELECTRICAL HORIZONTAL DEVICE OF THE COLD CATHODE DISCHARGE TYPE, AND A HOT FILAMENT ION SOURCE OF THE MASS SPECTROMETER AND MASS SPECTROMETER ANALYZER AND COLLECTOR MEANS, THE IMPROVEMENT WHEREIN THE COLD CATHODE DISCHARGE DEVICE IS ARRANGED IN SERIES BETWEEN ONE GAS FLOW INLET AND THE HOT FILAMENT ION SOURCE TO INTERCEPT AND PUMP A SUBSTANTIAL PORTION OF CARBONIZING GASSES ENTERING THE GAS FLOW INLET WHEREBY FILAMENT CONTAMINATION AND SENSITIVITY LOSS ARE LIMITED.
References Cited (Backward Citations)
US2427484A
Cited
US2643342A
Cited
US2490278A
Cited
US2967239A
Cited
US2772362A
Cited
US2975278A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-08-08 | 1970-02-07 | 1970-08-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-08 | 1974-02-07 | 1974-08-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-08 | 1978-02-07 | 1978-08-09 | $7700.00 | Window Closed / Lapsed |