US Patent 11691373 Paper lid production method
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US Patent 11691373 Paper lid production method
Article
A method for producing a paper lid includes a first step of holding down an outer edge area of a blank that is mainly made of paper, a second step of forming an inner fitting portion in a central area of the blank, while holding down the outer edge area, and a third step of forming an outer fitting portion in the central area, where the inner fitting portion is formed, while holding down the outer edge area.
Infobox
Is a
Patent Jurisdiction
Patent Number
116913731
Date of Patent
July 4, 2023
1Patent Application Number
170525171
Date Filed
July 11, 2019
1Patent Citations
Patent Primary Examiner
CPC Code
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