Frequency converter
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The broken line showing of the frequency converter represents unclaimed subject matter and forms no part of the claimed design.
Claims
The ornamental design for a frequency converter, as shown and described.
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Type: Grant
Filed: Sep 22, 2011
Date of Patent: Jul 1, 2014
Assignee: ABB Oy (Helsinki)
Inventors: Jani Hakala (Espoo), Mika Silvennoinen (Espoo)
Primary Examiner: Derrick Holland
Assistant Examiner: Lauren Calve
Application Number: 29/371,781