US5147465A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of cleaning a surface
Assignee: Mitsubishi Electric Corp
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Filing: 1990-10-30
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Granted: 1992-09-15
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Expires: 2010-10-30
Abstract
Abstract A method of cleaning a surface including generating helium ions, electrons, and metastable helium by exciting helium gas, separating said metastable helium from the helium ions and electrons, and exposing a substance to be processed on the surface of which foreign matter is present to the metastable helium separated from the helium ions and electrons to remove the foreign matter from the substance.
Inventors
- 👤 Takahiro Maruyama
- 👤 Toshiaki Ogawa
- 👤 Hiroshi Morita
- 👤 Tomoaki Ishida
- 👤 Kenji Kawai
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 09:09
CPC Classifications
H; H10; H10P; H10P72/00; H10P72/04; H10P72/0402; H10P72/0406; B; B08; B08B; B08B7/00; B08B7/0035; H01; H01J; H01J37/00; H01J37/32; H01J37/32009; H01J37/32357
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
110 words
A method of cleaning a surface of s substrate comprising: producing a magnetic field in a first chamber; introducing helium into the first chamber; exciting the helium in the first chamber to produce helium ions, electrons, and metastable helium; separating the helium ions and the electrons from the metastable helium in the first chamber by deflecting the helium ions and the electrons with the magnetic field; and conducting the metastable helium from the first chamber to a second chamber and to a surface of a substrate on which contaminants are present in the second chamber to interact with and remove the contaminants without etching of the surface of the substrate.
Claim 2
Independent Claim
110 words
A method of cleaning a surface of s substrate comprising: producing a magnetic field in a first chamber; introducing helium into the first chamber; exciting the helium in the first chamber to produce helium ions, electrons, and metastable helium; separating the helium ions and the electrons from the metastable helium in the first chamber by deflecting the helium ions and the electrons with the magnetic field; and conducting the metastable helium from the first chamber to a second chamber and to a surface of a substrate on which contaminants are present in the second chamber to interact with and remove the contaminants without etching of the surface of the substrate.
Claim 3
Dependent Claim
15 words
A method according to claim 1 including exciting said helium gas by electron cyclotron resonance.
References Cited (Backward Citations)
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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) | 1995-09-15 | 1996-03-16 | 1996-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-15 | 2000-03-16 | 2000-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-15 | 2004-03-16 | 2004-09-15 | $7700.00 | Window Closed / Lapsed |