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:
Nov. 14, 1989
Filed:
Oct. 08, 1987
Haruo Koharagi, Ibaraki, JP;
Kazuo Tahara, Hitachi, JP;
Tsunehiro Endo, Hitachiota, JP;
Kunio Miyashita, Hitachi, JP;
Yoshitaro Ishii, Hitachi, JP;
Fumio Jyoraku, Hitachi, JP;
Syuji Watanabe, Ibaraki, JP;
Hisanori Toyoshima, Hitachi, JP;
Kohichi Saito, Kitaibaraki, JP;
Wakichiro Hishi, Nagareyama, JP;
Koujirou Yamashita, Hitachi, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Method and apparatus for operating a vacuum cleaner in which by detecting a rotational speed of a variable speed fan motor adapted to give a suction force to the cleaner and its change range, the choking state of the filter and the state of the cleaned surface are discriminated, and a speed command of the fan motor is corrected on the basis of the result of the discrimination, and the comfortable cleaning can be performed by the optimum suction force.