Closure cover and extension ladder

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United States of America Patent

PATENT NO 10934776
SERIAL NO

16303676

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Importance

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Abstract

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A closure cover and an extension ladder are provided. The closure cover includes an upper closure plate, a lower closure plate, and two airtight sheets, the upper closure plate and the lower closure plate are fixedly connected by a connector, the upper closure plate and the lower closure plate are each provided with ventilation holes, the airtight sheets are fixed to a surface of the upper closure plate facing away from the lower closure plate and a surface of the lower closure plate facing away from the upper closure plate, respectively, and the airtight sheets are capable of controlling the closing and opening of the ventilation holes.

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First Claim

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Patent Owner(s)

Patent OwnerAddress
ZHOU MINQINGJINHUA ZHEJIANG 321000

International Classification(s)

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Huang, Jinchai Zhejiang, CN 1 1
Zhou, Minqing Zhejiang, CN 1 1

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