USD920408SActiveUtility

Piston ring for internal combustion engine

31
Assignee: KK RIKENPriority: Sep 25, 2018Filed: Mar 25, 2019Granted: May 25, 2021
Est. expirySep 25, 2038(~12.2 yrs left)· nominal 20-yr term from priority
Inventors:Hiroshi Shimizu
31
PatentIndex Score
0
Cited by
16
References
1
Claims

Claims

exact text as granted — not AI-modified
CLAIM 
     
       The ornamental design for a piston ring for an internal combustion engine, as shown and described.

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