US3792251A
Expired / Lapsed
US
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Surface analysis
Assignee: Phillips Petroleum Co
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Filing: 1971-04-08
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Granted: 1974-02-12
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Expires: 1991-04-08
Abstract
Abstract Surfaces are analyzed to determine materials adsorbed thereon by directing a beam of atoms or molecules excited to metastable levels onto the surface. Ions of the adsorbed material which are produced are analyzed, such as by a mass spectrometer.
Inventors
- 👤 T Schmidt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:25
CPC Classifications
H; H01; H01J; H01J49/00; H01J49/02; H01J49/10; H01J49/14; H01J49/142; G; G01; G01N; G01N23/00; G01N23/22; G01N2223/00; G01N2223/07; G01N2223/10; G01N2223/105
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
123 words
The method of analyzing a surface of a body having a material adsorbed thereon, which method comprises the steps of establishing a source of atoms or molecules which are excited to metastable levels, passing a beam of said excited atoms or molecules through a focusing means to impinge onto the surface to be analyzed so as to ionize the material adsorbed on said surface and eject from said adsorbed material ions representative of the material adsorbed on said surface, passing a beam of the ions so ejected from the adsorbed materail to an analysis means removing from the ions passed to the analysis means ions which have an energy level outside a predetermined range, and analyzing the remaining ions in a mass spectrometer.
Claim 2
Independent Claim
123 words
The method of analyzing a surface of a body having a material adsorbed thereon, which method comprises the steps of establishing a source of atoms or molecules which are excited to metastable levels, passing a beam of said excited atoms or molecules through a focusing means to impinge onto the surface to be analyzed so as to ionize the material adsorbed on said surface and eject from said adsorbed material ions representative of the material adsorbed on said surface, passing a beam of the ions so ejected from the adsorbed materail to an analysis means removing from the ions passed to the analysis means ions which have an energy level outside a predetermined range, and analyzing the remaining ions in a mass spectrometer.
Claim 3
Dependent Claim
24 words
The method Of claim 1 wherein the source is established by subjecting helium to a radio frequency electromagnetic field to produce metastable helium atoms.
Claim 4
Dependent Claim
15 words
The method of claim 2 wherein the surface comprises platinum having a hydrocarbon adsorbed thereon.
Claim 5
Dependent Claim
12 words
The method of claim 1 wherein the surface comprises a solid material.
References Cited (Backward Citations)
FR1240658A
Cited
US3415985A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |