Note and Warrant Exchange Agreement Sample Contracts

EXHIBIT 10.31

Note and Warrant Exchange Agreement • March 31st, 1998 • Uranium Resources Inc /De/ • Wholesale-metals & minerals (no petroleum) • Missouri

• Contract Type
  Note and Warrant Exchange Agreement
• Filed
  March 31st, 1998
• Company
  Uranium Resources Inc /De/
• Industry
  Wholesale-metals & minerals (no petroleum)
• Jurisdiction
  Missouri

NOTE AND WARRANT EXCHANGE AGREEMENT

Note and Warrant Exchange Agreement • January 4th, 2012 • VistaGen Therapeutics, Inc. • Pharmaceutical preparations • New York

• Contract Type
  Note and Warrant Exchange Agreement
• Filed
  January 4th, 2012
• Company
  VistaGen Therapeutics, Inc.
• Industry
  Pharmaceutical preparations
• Jurisdiction
  New York

This Note and Warrant Exchange Agreement (this “Agreement”) is dated as of December 29, 2011, by and between VistaGen Therapeutics, Inc., a Nevada corporation (the “Company”), and Platinum Long Term Growth VII, LLC (“Platinum”).

AMENDMENT TO NOTE AND WARRANT EXCHANGE AGREEMENT

Note and Warrant Exchange Agreement • November 13th, 2009 • CleanTech Biofuels, Inc. • Industrial organic chemicals • New York

• Contract Type
  Note and Warrant Exchange Agreement
• Filed
  November 13th, 2009
• Company
  CleanTech Biofuels, Inc.
• Industry
  Industrial organic chemicals
• Jurisdiction
  New York

This Amendment to Note and Warrant Exchange Agreement (this “Agreement”) is entered into as of the _______day of July, 2009, by and between Vertex Energy, Inc. (“Vertex”) and CleanTech Biofuels, Inc. (“CTB”).