Like I make a drawing with my name and you go and display it as a picture on your website with your logo on it.
You could call it plagiarism.
An usurper is one who takes or makes use of something without right.
Nowadays a patent is a monopoly (an exclusive right or holding) conferred by the state on, and for, the benefit of the originator and not a usurper of an invention.
Make no mistake, the only reason that a usurper would adopt another company’s legacy mark is to take the residual good will and divert business from the legacy brand owner. A few simple steps during re-branding can insure that your legacy mark enjoys a happy retirement
Another example is the text found in the web site of a company specialized in property rights protection :
USURPATION OF INDUSTRIAL PROPERTY RIGHTS
When a third party fraudulently uses the distinctive marks or new creations legally protected without the authorization of the owners, it may be denounced before the public prosecutor’s office to criminally condemn the acts of usurpation.
What is sought with this process is that the usurper is condemned to pay a fine, and in certain cases, a prison sentence of 3 to 6 years.
Appropriator could be possible.
someone who takes for his or her own use (especially without permission)