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The ornamental design for a piston ring for an internal combustion engine, as shown and described.
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The dash-dash broken lines depict portions of the piston ring which form no part of the claimed design and the dot-dash-dot broken lines depict the boundary of the claimed design and form no part thereof.
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Mar 25 2019 | Kabushiki Kaisha Riken | (assignment on the face of the patent) | / | |||
May 31 2019 | SHIMIZU, HIROSHI | Kabushiki Kaisha Riken | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 051177 | /0605 |
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