Device for preventing sewer backflow
The broken lines shown in the drawings are for the purpose of illustrating portions of the device for preventing sewer backflow and form no part of the claimed design.
Claims
I claim the ornamental design for a device for preventing sewer backflow, as shown and described.
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Type: Grant
Filed: Aug 12, 2016
Date of Patent: Aug 13, 2019
Inventor: Robert Campbell (Brampton)
Primary Examiner: Cynthia Ramirez
Assistant Examiner: Gino Colan
Application Number: 29/574,121