Patent US6030437A successfully refreshed from Google Patents.
US6030437A
Expired / Lapsed
US
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Gas purifier
Assignee: US Philips Corp
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Filing: 1998-03-11
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Granted: 2000-02-29
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Expires: 2018-03-11
Abstract
Abstract In a gas purifier, a gas flow is generated by a fan (15) and passed through a filter arrangement (14). A difference (SF) is measured (16, 19) between pollution levels in the gas flow before and after it has passed the filter arrangement (14). A controller (18) reduces the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Inventors
- 👤 Serge Gourrier
- 👤 Remy Polaert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 18:31
CPC Classifications
B; B01; B01D; B01D46/00; B01D46/42; B01D46/44; B01D46/46; F; F24; F24F; F24F8/00; F24F8/10; F24F8/108; F24F11/00; F24F11/30; F24F11/32; F24F11/39; F24F11/70; F24F11/72; F24F11/74; F24F11/77; Y; Y02; Y02B; Y02B30/00; Y02B30/70
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
85 words
A gas purification device comprising: a filter arrangement located in a chamber of said device; a gas-flow generating arrangement for generating a gas-flow which passes through the filter arrangement; and a gas-measuring arrangement comprising at least one transducer for measuring a difference (SF) between pollution levels in the gas flow before and after it has passed the filter arrangement; wherein the gas purifier comprises a controller for reducing the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Claim 2
Dependent Claim
85 words
A gas purification device comprising: a filter arrangement located in a chamber of said device; a gas-flow generating arrangement for generating a gas-flow which passes through the filter arrangement; and a gas-measuring arrangement comprising at least one transducer for measuring a difference (SF) between pollution levels in the gas flow before and after it has passed the filter arrangement; wherein the gas purifier comprises a controller for reducing the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Claim 3
Dependent Claim
24 words
A gas purification device as claimed in claim 1, wherein the gas-flow generating arrangement comprises a switch for intermittently making the gas-flow relatively strong.
Claim 4
Dependent Claim
109 words
A gas purifier comprising: a filter arrangement; a gas-flow generating arrangement for generating a gas-flow which passes through the filter arrangement, said gas-flow generating arrangement comprising a main gas-flow generator and an auxiliary gas-flow generator for providing a main portion of the gas-flow which is controllable, and an auxiliary portion of the gas-flow which is substantially constant, respectively; and a gas-measuring arrangement for measuring a difference (SF) between pollution levels in the gas flow before and after it has passed the filter arrangement; wherein the gas purifier comprises a controller for reducing the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Claim 5
Dependent Claim
109 words
A gas purifier comprising: a filter arrangement; a gas-flow generating arrangement for generating a gas-flow which passes through the filter arrangement, said gas-flow generating arrangement comprising a main gas-flow generator and an auxiliary gas-flow generator for providing a main portion of the gas-flow which is controllable, and an auxiliary portion of the gas-flow which is substantially constant, respectively; and a gas-measuring arrangement for measuring a difference (SF) between pollution levels in the gas flow before and after it has passed the filter arrangement; wherein the gas purifier comprises a controller for reducing the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Claim 6
Dependent Claim
86 words
A gas purifier comprising: a filter arrangement; a gas-flow generating arrangement for generating a gas-flow which passes through the filter arrangement, said gas-flow generating arrangement comprising an inverter for inverting the direction of the gas-flow; and a gas-measuring arrangement for measuring a difference (SF) between pollution levels in the gas flow before and after it has passed the filter arrangement; wherein the gas purifier comprises a controller for reducing the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Claim 7
Dependent Claim
86 words
A gas purifier comprising: a filter arrangement; a gas-flow generating arrangement for generating a gas-flow which passes through the filter arrangement, said gas-flow generating arrangement comprising an inverter for inverting the direction of the gas-flow; and a gas-measuring arrangement for measuring a difference (SF) between pollution levels in the gas flow before and after it has passed the filter arrangement; wherein the gas purifier comprises a controller for reducing the gas flow when the difference (SF) between the pollution levels drops below a threshold value (Th).
Claim 8
Dependent Claim
46 words
A gas purifier as claimed in claim 4, wherein the gas-measuring arrangement comprises: a gas-sensor for measuring a pollution level at one side of the filter arrangement; and a comparator for comparing the pollution levels before and after the direction of the gas-flow has been inverted.
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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) | 2003-02-28 | 2003-08-30 | 2004-02-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2007-02-28 | 2007-08-30 | 2008-02-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2011-02-28 | 2011-08-30 | 2012-02-29 | $7700.00 | Window Closed / Lapsed |