The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jul. 10, 2007
Filed:
Aug. 08, 2001
Thomas R. Anthony, Schenectady, NY (US);
Yavuz Kadioglu, Clifton Park, NY (US);
Suresh S. Vagarali, Columbus, OH (US);
Steven W. Webb, Worthington, OH (US);
William E. Jackson, Solon, OH (US);
William F. Banholzer, Niskayuna, NY (US);
John K. Casey, Dublin, IE;
Alan C. Smith, Dublin, IE;
Thomas R. Anthony, Schenectady, NY (US);
Yavuz Kadioglu, Clifton Park, NY (US);
Suresh S. Vagarali, Columbus, OH (US);
Steven W. Webb, Worthington, OH (US);
William E. Jackson, Solon, OH (US);
William F. Banholzer, Niskayuna, NY (US);
John K. Casey, Dublin, IE;
Alan C. Smith, Dublin, IE;
Bellataire International, LLC, Worthington, OH (US);
Abstract
The present invention is directed to a method for treating discolored natural diamond, especially Type IIa diamond and Type IaA/B diamond with nitrogen as predominantly B centers, for improving its color. The method includes preblocking and preshaping a discolored natural diamond to prevent its breakage in a high pressure/high temperature (HP/HT) press, placing said discolored natural diamond in a pressure transmitting medium which is consolidated into a pill. Next, the pill is placed into a HP/HT press at elevated pressure and elevated temperature within the graphite-stable or diamond-stable range of the carbon phase diagram for a time sufficient to improve the color of said diamond. Finally, the diamond is recovered from said press. Colorless and fancy colored diamonds can be made by this method.