revocation of a patent造句

IPCom was sued by Nokia in April 2010 for revocation of a patent relating to a mechanism for controlling access to the random access channel, a channel used by mobile devices when accessing the mobile telephone network.
The main reasons for revocation of a patent in opposition are a lack of inventive step ( 43 % ), a lack of novelty ( 22 % ) and an extension beyond the content of the application as filed ( 11 % ).
It's difficult to find revocation of a patent in a sentence. 用revocation of a patent造句挺难的