US4774433A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for generating metal ions
Assignee: Hitachi Ltd
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Filing: 1987-04-09
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Granted: 1988-09-27
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Expires: 2007-04-09
Abstract
Abstract A mixture of an alkali metal compound and its reducing agent is heated by a heating means, whereby alkali metal vapors are generated and stored in a vapor reserver. The thus stored vapors permeate through a porous member heated by another heating means and are ionized. The thus formed ions are withdrawn by an ion withdrawal means.
Inventors
- 👤 Yoshinori Ikebe
- 👤 Hifumi Tamura
- 👤 Hiroyasu Shichi
- 👤 Eiichi Izumi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:06
CPC Classifications
H; H01; H01J; H01J27/00; H01J27/02; H01J27/26
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
133 words
An apparatus for generating metal ions comprising: a vessel for holding a mixture of an alkali metal compound and a reducing agent, means for heating the mixture in the vessel to thereby react the alkali metal compound with the reducing agent in the vessel and generate alkali metal vapors, a vapor reservoir in fluid communication with said vessel for storing the generated alkali metal vapors, a porous member formed as part of a wall of the vapor reservoir capable of being permeated by the alkali metal vapors and having a higher melting point than the ionization temperature of the alkali metal vapors, means for heating the porous member to ionize alkali metal vapors which have permeated through the porous member and thereby generate the metal ions, and means for withdrawing the generated ions.
Claim 2
Independent Claim
133 words
An apparatus for generating metal ions comprising: a vessel for holding a mixture of an alkali metal compound and a reducing agent, means for heating the mixture in the vessel to thereby react the alkali metal compound with the reducing agent in the vessel and generate alkali metal vapors, a vapor reservoir in fluid communication with said vessel for storing the generated alkali metal vapors, a porous member formed as part of a wall of the vapor reservoir capable of being permeated by the alkali metal vapors and having a higher melting point than the ionization temperature of the alkali metal vapors, means for heating the porous member to ionize alkali metal vapors which have permeated through the porous member and thereby generate the metal ions, and means for withdrawing the generated ions.
Claim 3
Dependent Claim
47 words
An apparatus according to claim 1, wherein the vessel is in communication with the vapor reservoir through a fine hole whose opening is changeable with temperature and which serves to act as a lid preventing vapors to diffuse into the reservoir when the vessel is not heated.
References Cited (Backward Citations)
US2715694A
Cited
JPS5830055A
Cited
JPS58121536A
Cited
US4638217A
Cited
JPS60180048A
Cited
US4687938A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-09-27 | 1992-03-28 | 1992-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-27 | 1996-03-28 | 1996-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-27 | 2000-03-28 | 2000-09-27 | $7700.00 | Window Closed / Lapsed |