The "netbook" term was revived by Asus for its then-new line of small-screened DVD-less notebook computers. The Psion came out of the woodwork, with lawyer-written letters threatening blogs and others over use of the term.
Now Dell is fighting back through the US Patent & Trademark Office, accusing Psion of abandonment, genericness, and fraud.
One's thoughts spring immediately to Autodesk's attempt to use the USPTO (and civil courts) to monopolize use of DWG. Abandonment and fraud don't apply to Autodesk, but genericness does, as Dell's lawyers point out:
The term "netbook" has been widely used by the computer media and consumers to refer to a subset of "notebook" computers that are small and inexpensive.
Rewritten for DWG...
The term "DWG" has been widely used by the computer media and consumers to refer to a subset of "CAD" files.