Patent US3673405A successfully refreshed from Google Patents.
US3673405A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas inlet system for a mass spectrometer
Assignee: Bendix Corp
•
Filing: 1971-01-14
•
Granted: 1972-06-27
•
Expires: 1991-01-14
Abstract
Abstract A mass spectrometer having an improved inlet system which assures that there is a minimum time lag, generally of the order of milliseconds, between changes in the composition of a material being analyzed and the analysis of corresponding changes in the associated spectra. The inlet system includes a primary leak directly opposite and closely spaced to a secondary leak leading into an ionization chamber so that changes in the composition of a gas leaving the primary leak are more rapidly communicated to the ionization chamfer for faster analysis by the mass spectrometer.
Inventors
- 👤 Charles J Moorman
- 👤 Fred A Reuter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 11:12
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/10; H01J49/14
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
192 words
In combination with a mass spectrometer of the type having an ionization chamber for ionizing gas, said ionization chamber including a grid that periodically forces said ionized gas molecules into an analyzing region wherein said ionized gas molecules are separated according to their mass-to-charge ratio, the improvement comprising: a second chamber having an orifice in one wall, an orifice in another wall opposite said one wall, and an outlet disposed in said second chamber between said walls, said outlet adapted to be connected to a means for evacuating said second chamber, one of said second chamber walls, having an orifice, forming a common wall between said sEcond chamber and said ionization chamber; a tube disposed within said second chamber, said tube having one end spaced in the range of 13/32 to 1/32 of an inch from the orifice in said common wall between said ionization chamber and said second chamber, the other end of said tube extending through the orifice in the other wall of said second chamber and in fluid communication with said gas to be ionized so that said gas may rapidly travel into said ionization chamber from said tube.
Claim 2
Dependent Claim
192 words
In combination with a mass spectrometer of the type having an ionization chamber for ionizing gas, said ionization chamber including a grid that periodically forces said ionized gas molecules into an analyzing region wherein said ionized gas molecules are separated according to their mass-to-charge ratio, the improvement comprising: a second chamber having an orifice in one wall, an orifice in another wall opposite said one wall, and an outlet disposed in said second chamber between said walls, said outlet adapted to be connected to a means for evacuating said second chamber, one of said second chamber walls, having an orifice, forming a common wall between said sEcond chamber and said ionization chamber; a tube disposed within said second chamber, said tube having one end spaced in the range of 13/32 to 1/32 of an inch from the orifice in said common wall between said ionization chamber and said second chamber, the other end of said tube extending through the orifice in the other wall of said second chamber and in fluid communication with said gas to be ionized so that said gas may rapidly travel into said ionization chamber from said tube.
Claim 3
Dependent Claim
19 words
The combination recited in claim 1 wherein the volume of said ionization chamber is less than 1 cubic inch.
Claim 4
Dependent Claim
31 words
The combination as recited in claim 2 wherein said end of said tube, spaced from said orifice in said common wall, is located directly opposite said orifice in said common wall.
Claim 5
Dependent Claim
29 words
The combination as recited in claim 3 wherein the thickness of said common wall between said ionization chamber and said second chamber is between 0.0001 inch and 0.005 inch.
Claim 6
Dependent Claim
29 words
The combination as recited in claim 2 wherein the thickness of said common wall between said ionization chamber and said second chamber is between 0.0001 inch and 0.005 inches.
Claim 7
Dependent Claim
29 words
The combination as recited in claim 1 wherein the thickness of said common wall between said ionization chamber and said second chamber is between 0.0001 inch and 0.005 inch.
Claim 8
Dependent Claim
31 words
The combination as recited in claim 1 wherein said end of said tube, spaced from said orifice in said common wall, is located directly opposite said orifice in said common wall.
Claim 9
Dependent Claim
172 words
An inlet system for a mass spectrometer having an ionization chamber for ionizing a sample of gas to be analyzed, said ionization chamber including an aperture for receiving said gas sample and a grid for periodically accelerating said ionized gas molecules into an analyzing region wherein said ionized gas molecules are separated according to their mass-to-charge ratio, said inlet system comprising: a second chamber in vacuum-tight relationship with said ionization chamber with the wall of said ionization chamber having said aperture therein forming a common wall with said second chamber and with outlet means adapted to be connected to a means for evacuating said second chamber and gas feed means extending through a wall in said second chamber, said gas feed means having an outlet spaced in the range of 7/32 to 1/32 of an inch from said aperture in said common wall so that gas samples can be rapidly passed through said feed means, a part of said second chamber and said aperture in said common wall to said ionization chamber.
Claim 10
Dependent Claim
172 words
An inlet system for a mass spectrometer having an ionization chamber for ionizing a sample of gas to be analyzed, said ionization chamber including an aperture for receiving said gas sample and a grid for periodically accelerating said ionized gas molecules into an analyzing region wherein said ionized gas molecules are separated according to their mass-to-charge ratio, said inlet system comprising: a second chamber in vacuum-tight relationship with said ionization chamber with the wall of said ionization chamber having said aperture therein forming a common wall with said second chamber and with outlet means adapted to be connected to a means for evacuating said second chamber and gas feed means extending through a wall in said second chamber, said gas feed means having an outlet spaced in the range of 7/32 to 1/32 of an inch from said aperture in said common wall so that gas samples can be rapidly passed through said feed means, a part of said second chamber and said aperture in said common wall to said ionization chamber.
Claim 11
Dependent Claim
20 words
The combination as recited in claim 8 wherein the volume of said ionization chamber is less than 1 cubic inch.
Claim 12
Dependent Claim
29 words
The combination as recited in claim 9 wherein the thickness of said common wall between said ionization chamber and said second chamber is between 0.0001 inch and 0.005 inch.
Claim 13
Dependent Claim
29 words
The combination as recited in claim 8 wherein the thickness of said common wall between said ionization chamber and said second chamber is between 0.0001 inch and 0.005 inch.
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |