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:
Jun. 04, 1991
Filed:
May. 14, 1990
David C Ludwig, Towanda, PA (US);
Joseph J Penkunas, Sayre, PA (US);
GTE Products Corporation, Stamford, CT (US);
Abstract
A method for removing a paraffin wax based binder containing a fatty acid from a green article, wherein the article is made of material selected from the group consisting of ceramic powders and metallic powders, which comprises heating the article in a non-oxidizing atmosphere in a furnace by raising the temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a first temperature of about 50.degree. C. to 80.degree. C. and thereafter maintaining the first temperature for about 30 to 90 minutes to essentially completely melt the binder, raising the temperature from the first temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a second temperature of about 200.degree. C. to 225.degree. C. and thereafter maintaining the second temperature for about 30 to 90 minutes to essentially completely vaporize the paraffin wax, raising the temperature from the second temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a third temperature of about 260.degree. C. to 300.degree. C. and thereafter maintaining the third temperature for about 30 to 90 minutes to essentially completely vaporize the fatty acid, and raising the temperature from the third temperature at a rate of about 0.5.degree. C. to 1.0.degree. C. per minute to a fourth temperature of about 430.degree. C. to 480.degree. C. and thereafter maintaining the fourth temperature for about 30 to 90 minutes to insure complete vaporization of essentially all of the binder.