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:
Oct. 22, 1996
Filed:
Oct. 21, 1994
Naotake Mizoguchi, Tokyo, JP;
Tadao Takahashi, Tokyo, JP;
Senju Metal Industry Company Limited, Tokyo, JP;
Abstract
This invention discloses a furnace in which hot gases are discharged from heaters to provide uniform heating to printed circuit boards commonly used in the electronic industry. Outside air is prevented from flowing into the furnace, so as to reduce and to stabilize the concentration of oxygen. The furnace 1 is designed with an air tunnel 2 to separate it into upper and lower sections which are fitted with hot air blow type heaters 5a, 5b. The hot air discharged from the heaters in the upper and lower sections flow in opposite directions to create a counter-flow of gases. Each individual heater can produce its own hot air circuit. They are designed with the blowing outlet and suction inlet in the same structure with the blowing outlet fitted with a redirectional flow plate 18 which directs the hot air to the suction inlet.