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A conference call discussing the release of the Company's results for the year ended March 31, 2013 is scheduled for today, Monday, May 6, 2013 at 4:30 PM Eastern Time. 877-407-9205 (international: +1-201-689-8054) five to ten minutes before the scheduled start time and request to be connected to the ClearSign Combustion Corporation conference call. If you wish to listen to a replay of the conference call, you may dial 877-660-6853 (international: +1-201-612-7415) and enter conference ID 413681. The replay will be available from 24 hours after the conference call.

About ClearSign Combustion Corporation

ClearSign Combustion Corporation designs and develops technologies that aim to improve key performance characteristics of combustion systems including energy efficiency, emissions control, and fuel flexibility and overall cost effectiveness. Our Electrodynamic Combustion Control™ (ECC™) platform technology improves control of flame shape and heat transfer and optimizes the complex chemical reactions that occur during combustion in order to minimize harmful emissions. For more information about the Company, please visit www.clearsign.com

Cautionary note on forward-looking statements

This press release includes forward-looking information and statements within the meaning of the Private Securities Litigation Reform Act of 1995 and the provisions of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Except for historical information contained in this release, statements in this release may constitute forward-looking statements regarding our assumptions, projections, expectations, targets, intentions or beliefs about future events that are based on management's belief, as well as assumptions made by, and information currently available to, management. While we believe that our expectations are based upon reasonable assumptions, there can be no assurances that our goals and strategy will be realized. Numerous factors, including risks and uncertainties, may affect our actual results and may cause results to differ materially from those expressed in forward-looking statements made by us or on our behalf. Some of these factors include the acceptance of existing and future products, the impact of competitive products and pricing, general business and economic conditions, and other factors detailed in our Annual Report on Form 10-K and other periodic reports filed with the SEC. We specifically disclaim any obligation to update or revise any forward-looking statement whether as a result of new information, future developments or otherwise.

ClearSign Combustion Corporation(a Development Stage Company)Statements of Operations(Unaudited)                                                            For the Period                                                            from Inception                                                             (January 23,                                  For the three months           2008)                                    ended March 31,               to                                   2013          2012        March 31, 2013                               -----------   -----------   ----------------Operating expenses:  Research and development     $   458,000   $   264,000   $      2,166,000  General and administrative       903,000       600,000          7,899,000                               -----------   -----------   ----------------  Total operating expenses       1,361,000       864,000         10,065,000                               -----------   -----------   ----------------Loss from operations            (1,361,000)     (864,000)       (10,065,000)Other income (expense)               4,000        (1,000)            29,000                               -----------   -----------   ----------------Net Loss                       $(1,357,000)  $  (865,000)  $    (10,036,000)                               ===========   ===========   ================Net Loss per share             $     (0.15)  $     (0.17)  $          (2.50)                               ===========   ===========   ================Weighted average number of shares outstanding              8,781,348     5,153,315          4,011,703                               ===========   ===========   ================

ClearSign Combustion Corporation(a Development Stage Company)Balance Sheets(Unaudited)                                March 31,      December 31,                                   2013            2012                              -------------   -------------ASSETSCurrent Assets:  Cash and cash equivalents   $   6,655,000   $   8,027,000  Prepaid expenses                  158,000          60,000                              -------------   -------------    Total current assets          6,813,000       8,087,000Fixed assets, net                   489,000         400,000Patents and other intangible assets                             780,000         618,000Other assets                         10,000          10,000                              -------------   -------------    Total Assets              $   8,092,000   $   9,115,000                              =============   =============LIABILITIES AND STOCKHOLDERS' EQUITYCurrent Liabilities:  Accounts payable            $     325,000   $     276,000  Accrued compensation              265,000         168,000                              -------------   -------------    Total current     liabilities                    590,000         444,000Deferred rent                        34,000          35,000                              -------------   -------------    Total liabilities               624,000         479,000                              -------------   -------------Stockholders' Equity:  Common stock, 8,782,015   and 5,157,716 shares   issued and outstanding at   March 31, 2013 and 2012,   respectively                                      1,000           1,000  Additional paid-in capital     17,503,000      17,314,000  Deficit accumulated in the   development stage            (10,036,000)     (8,679,000)                              -------------   -------------    Total stockholders'     equity                       7,468,000       8,636,000                              -------------   -------------  Total Liabilities and   Stockholders' Equity       $   8,092,000   $   9,115,000                              =============   =============