As a reminder to the complexity of this process, please see drawings associated with one of Dr.Taylor's latest patents: Fabrication Methodology for Optoelectronic Integrated Circuits

please take a few moments to study the drawings and workflow.  Presumably, just a few of these steps were in need of some tweaking.

On the subject of patents, a search on the WIPO database (Taylor AND Opel) results in 68 patents, an impressive 18 published in 2016 alone.  What is a reasonable amount time from patent publication to commercial product, who knows....hopefully some or all of these will eventually come to fruition.