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. 02, 2000
Filed:
May. 10, 1999
Applicant:
Inventors:
Assignee:
Aisan Kogyo Kabushiki Kaisha, , JP;
Primary Examiner:
Int. Cl.
CPC ...
B67B / ; B67D / ; H01L / ; G01G / ;
U.S. Cl.
CPC ...
177116 ; 177121 ; 222-1 ; 222 55 ; 222200 ; 310316 ; 73-136 ; 702 45 ; 702100 ;
Abstract
Disclosed is the powder feeder in which the duty ratio X.sub.T corresponding to the target feed amount Q.sub.T is calculated on the basis of the calibration curve obtained by the feeder calibration which is conducted before the start of powder feed, and the powder P starts to be fed according to the duty ratio X.sub.T, therefore, the actual feed amount can reach to the target feed amount Q.sub.T in a short time (within the time T.sub.1) from the start of powder feed, and the powder P can be fed while controlling the actual feed amount with high accuracy, and further the powder P can be precisely fed even in case of the short time feed for several seconds.