Ring binder mechanism having a convex central rib
The broken lines in the drawings illustrate portions of the ring binder mechanism having a convex central rib and form no part of the claimed design.
Claims
The ornamental design for a ring binder mechanism having a convex central rib, as shown and described.
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Type: Grant
Filed: Jun 12, 2012
Date of Patent: Dec 15, 2015
Assignee: Kam Hold (Macao Commercial Offshore) Limited (Macau)
Inventor: Jian Yong Qiu (Cen Xi)
Primary Examiner: Sheryl Lane
Assistant Examiner: Ieisha Price
Application Number: 29/424,445