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:
Jan. 21, 1986
Filed:
Apr. 21, 1983
Michael J Collins, Matthews, NC (US);
Wyatt P Hargett, Jr, Matthews, NC (US);
CEM Corporation, Matthews, NC (US);
Abstract
An apparatus for ashing materials which comprises a chamber, a source of microwave radiation for direction onto contents of the chamber, and in the chamber a support, such as a fused quartz pad or crucible, for the material to be ashed, and an ashing means of a stable microwave absorptive material, capable of being heated to high temperature by microwave radiation, such as a flat block of silicon carbide or a plurality of such blocks with openings therein to accommodate the crucible. The ashing means is in contact with the support for the material to be ashed and is capable of heating such support and such material to an ashing temperature. When a fused quartz fiber pad, preferably of the non-woven cloth type, is employed on top of and in contact with the ashing means of microwave absorptive material, as a support for the material to be ashed, it is preferred to cover such material with another such pad, which inhibits loss of the ash due to its being carried out of the chamber, as by an exhaust fan, while yet permitting the release of gases generated during the ashing process. Also disclosed are processes for ashing materials and for analyzing such materials for ash content, which processes may be practiced with the aid of the described apparatus.