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/* Control patents */
The present study on the IP activity in the area of horizontal axis wind turbines with focus on '''''Doubly-fed Induction Generator (DFIG)''''' is based on a search conducted on Thomson Innovation.
==Control patentsPatents== {|border="2" cellspacing="0" cellpadding="5" width="100%"|bgcolor = "#99ccff"| <center>'''S No'''</center>|bgcolor = "#99ccff"| <center>'''Patent / Publication No.'''</center>|bgcolor = "#99ccff"| <center>'''Publication Date'''</center>|bgcolor = "#99ccff"| <center>'''Assignee / Applicant'''</center>|bgcolor = "#99ccff"| <center>'''Title'''</center>
{|border="2" cellspacing="0" cellpadding="4" width="100%"
|align = "center" bgcolor = "#4F81BD"|<font color="#FFFFFF">'''S. No.'''</font>
|align = "center" bgcolor = "#4F81BD"|<font color="#FFFFFF">'''Patent/Publication No.'''</font>
|align = "center" bgcolor = "#4F81BD"|<font color="#FFFFFF">'''Publication Date<br>(mm/dd/yyyy)'''</font>
|align = "center" bgcolor = "#4F81BD"|<font color="#FFFFFF">'''Assignee/Applicant'''</font>
|align = "center" bgcolor = "#4F81BD"|<font color="#FFFFFF">'''Title'''</font>
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| stylealign = "center" bgcolor ="background-color:#99ccffDCE6F1"| <center>'''1'''</center>| <align = "center" bgcolor = "#DCE6F1"|<font color="#0000FF"><u>[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6278211.PN.&OS=PN/6278211&RS=PN/6278211 US6278211B1US6278211]</centeru></font>| <align = "center>02/" bgcolor = "#DCE6F1"|08/01<02/center>01| <center>bgcolor = "#DCE6F1"|Sweo Edwin A</center>| bgcolor = "#DCE6F1"|Brushless doubly-fed induction machines employing dual cage rotors
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| stylealign ="background-color:#99ccffcenter"| <center>'''2'''</center>| align = "center"|<centerfont color="#0000FF"><u>[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=6954004.PN.&OS=PN/6954004&RS=PN/6954004 US6954004B2US6954004]</centeru></font>| <align = "center>"|10/11/10/05</center>| <center>Spellman High Voltage Electron</center>| Doubly fed induction machine
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| stylealign = "center" bgcolor ="background-color:#99ccffDCE6F1"| <center>'''3'''</center>| <align = "center" bgcolor = "#DCE6F1"|<font color="#0000FF"><u>[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7411309.PN.&OS=PN/7411309&RS=PN/7411309 US7411309B2US7411309]</centeru></font>| <align = "center>" bgcolor = "#DCE6F1"|08/12/08/08</center>| <center>bgcolor = "#DCE6F1"|Xantrex Technology Inc</center>| bgcolor = "#DCE6F1"|Control system for doubly fed induction generator
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| stylealign ="background-color:#99ccffcenter"| <center>'''4'''</center>| align = "center"|<centerfont color="#0000FF"><u>[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7485980.PN.&OS=PN/7485980&RS=PN/7485980 US7485980B2US7485980]</centeru></font>| <align = "center>"|02/03/02/09</center>| <center>Hitachi Ltd</center>| Power converter for doubly-fed power generator system
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| stylealign = "center" bgcolor ="background-color:#99ccffDCE6F1"| <center>'''5'''</center>| <align = "center" bgcolor = "#DCE6F1"|<font color="#0000FF"><u>[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7800243.PN.&OS=PN/7800243&RS=PN/7800243 US7800243B2US7800243]</centeru></font>| <align = "center>21/" bgcolor = "#DCE6F1"|09/21/10</center>| <center>bgcolor = "#DCE6F1"|Vestas Wind Systems </center>| bgcolor = "#DCE6F1"|Variable speed wind turbine with doubly-fed induction generator compensated for varying rotor speed|-|align = "center"|6|align = "center"|<font color="#0000FF"><u>[http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=7830127.PN.&OS=PN/7830127&RS=PN/7830127 US7830127]</u></font>|align = "center"|11/09/10|Wind to Power System|Doubly-controlled asynchronous generator
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