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US Patent 7413641 Gas sensor with improved structure of protective cover

Patent 7413641 was granted and assigned to Denso on August, 2008 by the United States Patent and Trademark Office.

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Patent
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Patent attributes

Current Assignee
Denso
Denso
Patent Jurisdiction
United States Patent and Trademark Office
United States Patent and Trademark Office
Patent Number
7413641
Date of Patent
August 19, 2008
Patent Application Number
10759175
Date Filed
January 20, 2004
Patent Primary Examiner
‌
Kaj K. Olsen
Patent abstract

An improved structure of a protective cover assembly of a gas sensor is provided. The protective cover assembly is of a double-walled structure made up of an inner and an outer cylindrical cover with gas holes. A sensing element is disposed within the inner cover. At least one of the gas holes of the outer cover partially faces a side wall of the inner cover. A top end surface of the inner cover lies within a range defined between opposed portions of a perimeter of the at least one of the gas holes of the outer cover closest to a top and a base end of the cover assembly, respectively. This structure works to avoid breakage of the sensing element arising from wetting with water and to improve a response rate of the gas sensor.

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