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[patent_doc_number] => 20180311456
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[patent_issue_date] => 2018-11-01
[patent_title] => Filtering Mask with Adaption to Face Shape and Method for Improving the Airtightness of Filtering Mask
[patent_app_type] => utility
[patent_app_number] => 15/693240
[patent_app_country] => US
[patent_app_date] => 2017-08-31
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[rel_patent_id] =>[rel_patent_doc_number] =>) 15/693240 | Filtering Mask with Adaption to Face Shape and Method for Improving the Airtightness of Filtering Mask | Aug 30, 2017 | Abandoned |