Exhibit 10a Assignment of Intellectual Property Rights Fuel-Tech N.V. to Platinum Plus, Inc. As of November 5, 1997 Fuel-Tech N.V., a Netherlands Antilles limited liability company "Assignor" (the "Company"), does hereby, as a capital contribution, assign to its wholly-owned subsidiary Platinum Plus, Inc., a Delaware corporation (the "Assignee"), all of the Companys right, title and interest whatsoever in the United States of America and in any other jurisdiction worldwide, in and to: 1. That certain License Agreement effective as of October 28, 1994 between the Company and Clean Diesel Technologies, Inc. (the "License"). 2. All of the intellectual property, including patents, patent applications technology, data and know-how, set forth on Schedule A to the License. 3. The assignee agrees to accept this assignment and to hold Assignor harmless from any cost or expense required to prosecute, maintain or exploit the property described in Section 2 above. 4. Assignor agrees to cooperate with Assignee at the expense of the Assignee in perfecting the assignments made herein and to execute and deliver to the Assignee any further agreements, assignments, instruments, certificates and other documents deemed necessary or appropriate for that purpose by the Assignee. 5. By this assignment the Assignee is the owner of the assigned property in all respects and may deal with such property as it shall deem appropriate. FUEL-TECH N.V. Dated: December 19, 1997 By: /s/ Jeremy D. Peter-Hoblyn -------------------------------------- Jeremy D. Peter-Hoblyn Managing Director Agreed to this 19 day of December, 1997 Platinum Plus, Inc. By: /s/ James M. Valentine ------------------------------ James M. Valentine Executive Vice President State of Connecticut : ) ss Stamford County of Fairfield : The within instrument was acknowledged before me this 19th day of December 1997 by Jeremy D. Peter-Hoblyn, Managing Director of Fuel-Tech N.V., a Netherlands Antilles corporation, and James M. Valentine, Executive Vice President of Platinum Plus, Inc., a Delaware corporation, on behalf of their respective corporations. /s/ Charles W. Grinnell -------------------------------------- Charles W. Grinnell Commissioner of the Superior Court