US3842266A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Atmospheric sampling probe for a mass spectrometer
Assignee: United States Department of the Air Force
•
Filing: 1973-04-11
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Granted: 1974-10-15
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Expires: 1993-04-11
Abstract
Abstract An atmospheric sampling probe capable of generating a molecular beam for mass spectrometer analyzation including a quartz gas inlet orifice adjustable in any plane with a first vacuum stage; a quartz skimmer orifice adjustable in one plane having a second vacuum stage and a collimating orifice and ionizing chamber adapted to be connected to a quadrupole mass spectrometer with a third vacuum stage.
Inventors
- 👤 R Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 02:48
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/24; G; G01; G01N; G01N1/00; G01N1/02; G01N1/22; G01N1/2273; G01N33/00; G01N33/48; G01N33/483; G01N33/497
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
195 words
A system for continuously sampling gases at atmospheric pressure comprising: a sample probe means, including a first microorifice mounted on a frame and movable in any plane, a second microorifice positioned in line with said first microorifice, adjacent thereto and movable in one plane and a third orifice positioned in line with said first and second microorifices and spaced therefrom; a first stage vacuum system for creating a vacuum; a first vacuum chamber, connected between said first microorifice and said first stage vacuum system; a second stage vacuum system for creating a vacuum of greater magnitude than the first stage vacuum system; a second vacuum chamber positioned within said first vacuum chamber connecting the second stage vacuum system and said second microorifice; a third stage vacuum system for creating a vacuum of greater magnitude than said second stage vacuum system; a third vacuum chamber, connected between said third stage vacuum system and said third orifice, in juxtaposition to said second vacuum chamber and a mass spectrometer detector means connected to the said third vacuum chamber whereby gases entering the sampling probe means pass therethrough forming an uncontaminated molecular beam for detection in the mass spectrometer.
Claim 2
Independent Claim
195 words
A system for continuously sampling gases at atmospheric pressure comprising: a sample probe means, including a first microorifice mounted on a frame and movable in any plane, a second microorifice positioned in line with said first microorifice, adjacent thereto and movable in one plane and a third orifice positioned in line with said first and second microorifices and spaced therefrom; a first stage vacuum system for creating a vacuum; a first vacuum chamber, connected between said first microorifice and said first stage vacuum system; a second stage vacuum system for creating a vacuum of greater magnitude than the first stage vacuum system; a second vacuum chamber positioned within said first vacuum chamber connecting the second stage vacuum system and said second microorifice; a third stage vacuum system for creating a vacuum of greater magnitude than said second stage vacuum system; a third vacuum chamber, connected between said third stage vacuum system and said third orifice, in juxtaposition to said second vacuum chamber and a mass spectrometer detector means connected to the said third vacuum chamber whereby gases entering the sampling probe means pass therethrough forming an uncontaminated molecular beam for detection in the mass spectrometer.
Claim 3
Dependent Claim
19 words
A system for sampling gases according to claim 1 wherein said first and second orifices are formed of quartz.
Claim 4
Dependent Claim
50 words
A system for sampling gases according to claim 2 wherein said first stage vacuum system includes a pump, means for removing condensibles from said stage, and ballast means between the pump and condensibles removing means to prevent overload to the pump when the probe means is open to atmosphereic pressure.
Claim 5
Dependent Claim
19 words
A system for sampling gases according to claim 3 wherein said second stage vacuum system includes a turbomolecular pump.
Claim 6
Dependent Claim
17 words
A system for sampling gases according to claim 4 wherein said third stage include an ion pump.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |