US5474747A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas purifier using plasma and catalyst
Assignee: Fujitsu Ltd
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Filing: 1993-10-22
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Granted: 1995-12-12
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Expires: 2013-10-22
Abstract
Abstract A gas purifier comprising a casing, and two magnetically sensitive reeds arranged in the casing so that one reed extends from one end wall of the casing and the other reed extends from the other end wall of the casing and the free ends of the reeds overlap one above another with a small gap therebetween to form opposing contacts. The magnetically sensitive reeds are magnetically moved by a driving coil so that the contacts are opened and closed like a switch. This operation of the contacts and the contact load coil induces a glow discharge by which a gas is purified by an action of the plasma. A catalyst is carried by the contacts or the casing. Therefore, gas is purified synergically by the action of the plasma and the action of the catalyst. It is also possible to operate the magnetically sensitive reeds, or the like electrodes, by an AC voltage to induce a glow discharge.
Inventors
- 👤 Yuji Hayashi
- 👤 Noboru Wakatsuki
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 11:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/9454; B01D53/22; B01D53/229; B01D53/32; B01J; B01J19/00; B01J19/08; B01J19/087; B01J19/088; F; F01; F01N; F01N3/00; F01N3/08; F01N3/0892; F01N3/10; F01N3/24; F01N3/28; F01N3/2882; F01N2240/00; F01N2240/28; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
78 words
A gas purifier comprising: a casing having at least two openings allowing gas to flow through said casing; at least one pair of opposing electrodes arranged in said casing, each pair of opposing electrodes having a respective pair of substantially parallel opposing surfaces with a gap therebetween, the opposing surfaces being formed from a catalyst comprising a transition metal; and an A C power supply for inducing glow discharge on said at least one pair of opposing electrodes.
Claim 2
Dependent Claim
78 words
A gas purifier comprising: a casing having at least two openings allowing gas to flow through said casing; at least one pair of opposing electrodes arranged in said casing, each pair of opposing electrodes having a respective pair of substantially parallel opposing surfaces with a gap therebetween, the opposing surfaces being formed from a catalyst comprising a transition metal; and an A C power supply for inducing glow discharge on said at least one pair of opposing electrodes.
Claim 3
Dependent Claim
22 words
A gas purifier according to claim 1, wherein said at least one pair of electrodes comprise magnetically sensitive reeds having opposing contacts.
Claim 4
Dependent Claim
26 words
A gas purifier according to claim 2, further comprising a driving coil for opening and closing said contacts of said at least one pair of reeds.
Claim 5
Dependent Claim
27 words
A gas purifier according to claim 1, wherein said at least one pair of electrodes comprise wide electrode films substantially extending between said at least two openings.
Claim 6
Dependent Claim
14 words
A gas purifier according to claim 1, wherein said catalyst comprises a precious metal.
Claim 7
Dependent Claim
36 words
A gas purifier according to claim 1, further comprising an outer housing having a gas inlet and a gas outlet, said outer housing accommodating at least one casing having said at least one pair of electrodes.
Claim 8
Dependent Claim
53 words
A gas purifier according to claim 1, further comprising a gas separator means arranged on an upstream side of said casing having said at least two openings, said at least one pair of opposing electrodes, and said catalyst for selectively separating a gas to be purified from a gas flowing through said casing.
Claim 9
Dependent Claim
51 words
A gas purifier according to claim 7, further comprising at least one outer housing having a gas inlet and a gas outlet, said outer housing accommodating at least one casing having said at least one pair of electrodes, said gas separator means arranged on an upstream side of said outer housing.
Claim 10
Dependent Claim
17 words
A gas purifier according to claim 8, wherein said gas separator means includes a gas separating membrane.
Claim 11
Dependent Claim
28 words
A gas purifier according to claim 9, wherein said gas separating membrane mainly separates oxygen from nitrogen compounds and the separated nitrogen compound is introduced into said casing.
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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) | 1998-12-11 | 1999-06-12 | 1999-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-12-11 | 2003-06-12 | 2003-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-12-11 | 2007-06-12 | 2007-12-12 | $7700.00 | Window Closed / Lapsed |