That would be more in the nature of an addendum to an existing patent by one or more of the existing patent holders. I was thinking more in terms of some things I've read on the subject that allow unrelated-outside parties to over-ride your patent with another one based on 'improvements'...as somewhat described in this article; "By far, most inventions are improvements upon other known devices or solutions........Something is “new” in patent terms if there is no prior art that isidentical." http://www.ipwatchdog.com/2014/05/03/the-successful-inventor-patenting-improvements/id=49396/