Company:  CLEARSIGN COMBUSTION CORP (CLIR)
Form Type:  424B3
Filing Date:  5/1/2012 
CIK:  0001434524 
Address:  12870 INTERURBAN AVENUE SOUTH 
City, State, Zip:  SEATTLE, Washington 98168 
Telephone:  (206) 673-4848 
Last Trade
Last Trade: 
$9.26  
Change: 
0.32 (3.58%)  
Trade Time: 
May 17  
Market Cap: 
$81.42M
Description of Business
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  FORM 424B3
    TABLE OF CONTENTS
    Prospectus Summary
    SUMMARY SELECTED FINANCIAL INFORMATION
      INCOME STATEMENT
    RISK FACTORS
    SPECIAL NOTE REGARDING FORWARD-LOOKING STATEMENTS AND OTHER ...
    BUSINESS
      Employees
      NAME AND TITLE
      Properties
      Legal Proceedings
    MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION
      Liquidity and Capital Resources
      NAME AND TITLE
    EXECUTIVE COMPENSATION
      COMPENSATION TABLE
      Compensation Committee Interlocks and Insider Participation
    Director Compensation
      Indemnification
    DESCRIPTION OF CAPITAL STOCK
    Authorized Capitalization
    DIVIDEND POLICY AND OTHER SHAREHOLDER MATTERS
    SECURITY OWNERSHIP OF CERTAIN BENEFICIAL OWNERS AND MANAGEMENT
      BENEFICIAL OWNERS
    CERTAIN RELATIONSHIPS AND RELATED TRANSACTIONS, AND DIRECTOR ...
      BENEFICIAL OWNERS
    PLAN OF DISTRIBUTION
    USE OF PROCEEDS
    LEGAL MATTERS
    EXPERTS
    WHERE YOU CAN FIND MORE INFORMATION
    INDEX TO FINANCIAL STATEMENTS
      REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM
        BALANCE SHEET
        INCOME STATEMENT
        STOCKHOLDERS EQUITY
        CASH FLOW
      Notes to Financial Statements
    Note 1 - Organization and Description of Business
      OPTIONS