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Håkan Lans
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== STDMA == Håkan Lans is the designer of a tracking system which makes use of a [[Self-Organized Time Division Multiple Access]] (STDMA) datalink. The STDMA datalink is currently in use in [[Automatic Identification System]] (AIS). AIS is a short range coastal tracking system which is mandatory aboard international voyaging ships with [[gross tonnage]] (GT) of 300 or more tons, and all passenger ships regardless of size. STDMA is also in use as one of the three physical layer models proposed for [[Automatic dependent surveillance-broadcast]] (ADS-B), a cooperative surveillance technique for air traffic control. Lans's protocol is used for [[ADS-B#Sweden|ADS-B in Sweden]]. For his STDMA invention, Lans was nominated for the 2007 [[European Inventor Award]], though he did not win. Lans also won the The STDMA patent was awarded to Lans in 1996, but a [[United States Patent and Trademark Office|US patent]] ex-parte [[reexamination]] certificate was issued in 2010 canceling all claims.<ref>USPTO ex-parte reexamination certificate 7428, issued on March 30, 2010</ref><ref>{{Cite patent|number=US5506587A|title=Position indicating system|gdate=1996-04-09|invent1=Lans|inventor1-first=Hakan|url=https://patents.google.com/patent/US5506587A#legalEvents}}</ref>
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