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:
Nov. 02, 2004
Filed:
Feb. 03, 2003
Jiping Cheng, State College, PA (US);
Dinesh Agrawal, State College, PA (US);
Rustum Roy, State College, PA (US);
The Penn State Research Foundation, University Park, PA (US);
Abstract
An apparatus ( ) for the development of transparent alumina ceramics using microwave energy at the frequency between 0.915 and 2.45 GHz inclusive in hydrogen atmosphere at ambient pressure comprises an enclosed, insulated chamber ( ) to retain a workpiece ( ) for the application of microwave energy. The chamber comprises a TE single mode or a multimode microwave cavity into which is mounted a quartz tube ( ). An insulation material ( ), transparent to microwave energy, is positioned within the quartz tube. A port ( ) for the introduction of hydrogen penetrates the cavity so that the microwave sintering of the workpiece is performed in an ultra-pure hydrogen atmosphere. The workpiece is preferably mounted on a refractory ceramic such as alumina tube for the microwave sintering process. A method, preferably using the apparatus, develops transparent alumina ceramics and single crystal sapphire.