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US 6,030,437 AGranted
Gas purifier
AssigneeU.S. Philips Corporation
InventorsSerge Gourrier, Remy Polaert
Life of this patent
Estimating the term…
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).
Claims5
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).
2 more elements
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).
2 more elements
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).
2 more elements
Dependencies are inferred from the claim text.