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:
May. 29, 1990
Filed:
Jul. 03, 1986
Michael L Osgar, Eagan, MN (US);
Fluoroware, Inc., Chaska, MN (US);
Abstract
The method of joining together the ends of ducts made of melt processible fluoropolymers such as Teflon PFA, which are characterized by a high degree of chemical inertness and a continuous service temperature in the range of 300.degree. to 500.degree. F. The joining of the ends together is accomplished by the use of infrared heat emanating from an infrared heat source with temperatures in the range of 1250.degree. to 2000.degree. F. and spaced from the ends of the duct by approximately 1/4' to 2 inches for a period of time approximately up to one minute which may be gauged by the appearance of the duct end as it becomes visibly molten to a depth of approximately 1/2'. The infrared heater is then removed and the ducts are put together under almost no pressure and the ducts are held briefly, in one form, less than a minute, to quickly establish a joint that becomes at least as strong and expectedly stronger than the original ducts.