Spats, as far as I know, the details for microstamping ownership are as follows:
Inventors: Todd E. Lizotte, Orest Ohar
Assignees: Identification Dynamics, LLC
Patent No.
7111423 (issued 09-26-2006) and
6886284 (issued 05-03-2005), among other related patents. These patents are valid until about 2023.
The above was valid as of 2007, when the CA law was passed (was to have gone into effect, Jan. 2010). The patents may have been bought by others. I simply don't know, as I haven't keep up on that end of it.
What I do know is that the CA Microstamping law has not gone into effect because there is only one company that owns the patents. There was an exception placed on that law that said that the technology had to be offered by more than one company and could not be encumbered by patents.
At the very least, the technology is still encumbered by the original patents, else the CA law would have been triggered.