Steve,
You're right about the patent being unassigned.
FWIW, one of the co-inventors was one of the people that was given a contract at the time of the purchase agreement. Actually I just realized that those contracts were made between the employees and Dicon, not Spongetech:
July 9, 2009
PERSONAL & CONFIDENTIAL
Michael Derr
Dear Michael:
This is a compensation arrangement between Michael Derr and Dicon Technologies LLC (the "Company"), effective July 1, 2009 and ending June 30, 2010.
1. As Vice President of Research and Development for Dicon Technologies, your Compensation arrangement during the year 2009-2010 will follow Schedule A of this agreement. As an employee, you will be eligible for the various fringe benefits program pursuant to the terms of such programs available for employees occupying positions of similar status with the Company.