USPTO Information on US patents:
http://www.uspto.gov/patft/index.html

   
USPTO Information on trademarks:
http://tarr.uspto.gov/ 

   
Status of German patents, trademarks and applications:
http://register.dpma.de/DPMAregister/uebersichthttp://web.archive.org/web/20160820000305/https://dpinfo.dpma.de/  

   
Status of EP patents and applications:
https://register.epoline.org/espacenet/regviewer

   
Status of European Trademarks:
http://oami.europa.eu/CTMOnline/RequestManager/en_SearchBasic_NoReg  

   
Status of European Design Rights:
http://oami.europa.eu/RCDOnline/RequestManager