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US Patent 10619448 Flapper valve tool

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Is a

Patent attributes

Patent Jurisdiction

United States Patent and Trademark Office

Patent Number

Date of Patent

April 14, 2020

Patent Application Number

16212961

Date Filed

December 7, 2018

Patent Citations Received

US Patent 11448038 Reverse cementing valve system and method employing a double flapper valve with sliding sleeve and drillable nose

US Patent 11359460 Locking backpressure valve

US Patent 11365605 Locking backpressure valve

US Patent 11391119 Differential fill valve with collet sleeve

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