Unidirectional valve
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Description
In the drawings, the broken lines depict environmental subject matter only and form no part of the claimed design.
Claims
The ornamental design for a unidirectional valve, as shown and described.
Patent History
Patent number: D676527
Type: Grant
Filed: Dec 16, 2009
Date of Patent: Feb 19, 2013
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventors: Thomas J. Xue (St. Paul, MN), Michael K. Domroese (Woodbury, MN), Philip G. Martin (Forest Lake, MN), David M. Blomberg (Lino Lakes, MN), Nathan A. Abel (Minneapolis, MN)
Primary Examiner: Garth Rademaker
Application Number: 29/352,087
Type: Grant
Filed: Dec 16, 2009
Date of Patent: Feb 19, 2013
Assignee: 3M Innovative Properties Company (St. Paul, MN)
Inventors: Thomas J. Xue (St. Paul, MN), Michael K. Domroese (Woodbury, MN), Philip G. Martin (Forest Lake, MN), David M. Blomberg (Lino Lakes, MN), Nathan A. Abel (Minneapolis, MN)
Primary Examiner: Garth Rademaker
Application Number: 29/352,087
Classifications
Current U.S. Class:
Symmetrical On One Axis (D23/248)