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The ornamental design for a frequency converter, as shown and described.
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The broken line showing of the frequency converter represents unclaimed subject matter and forms no part of the claimed design.
Silvennoinen, Mika, Hakala, Jani
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Executed on | Assignor | Assignee | Conveyance | Frame | Reel | Doc |
Aug 23 2011 | HAKALA, JANI | ABB Oy | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 027061 | /0476 | |
Aug 25 2011 | SILVENNOINEN, MIKA | ABB Oy | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 027061 | /0476 | |
Sep 22 2011 | ABB Oy | (assignment on the face of the patent) | / | |||
Apr 17 2018 | ABB Oy | ABB Schweiz AG | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 047801 | /0174 |
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