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:
Aug. 09, 2005
Filed:
Apr. 09, 2003
Kazunari Fujiyama, Kanagawa-ken, JP;
Toshihiro Fujiwara, Kanagawa-ken, JP;
Kazuhiro Saito, Kanagawa-ken, JP;
Taiji Hirawawa, Kanagawa-ken, JP;
Satoshi Nagai, Kanagawa-ken, JP;
Hitoshi Kichise, Kanagawa-ken, JP;
Mitsuyoshi Okazaki, Saitama-ken, JP;
Hirotsugu Kodama, Tokyo-to, JP;
Seiichi Asatsu, Kanagawa-ken, JP;
Masanori Minowa, Tokyo-to, JP;
Takayuki Iwahashi, Kanagawa-ken, JP;
Shigeru Harada, Tokyo-to, JP;
Mamoru Sudo, Kanagawa-ken, JP;
Fumiharu Ishii, Tokyo-to, JP;
Kazunari Fujiyama, Kanagawa-ken, JP;
Toshihiro Fujiwara, Kanagawa-ken, JP;
Kazuhiro Saito, Kanagawa-ken, JP;
Taiji Hirawawa, Kanagawa-ken, JP;
Satoshi Nagai, Kanagawa-ken, JP;
Hitoshi Kichise, Kanagawa-ken, JP;
Mitsuyoshi Okazaki, Saitama-ken, JP;
Hirotsugu Kodama, Tokyo-to, JP;
Seiichi Asatsu, Kanagawa-ken, JP;
Masanori Minowa, Tokyo-to, JP;
Takayuki Iwahashi, Kanagawa-ken, JP;
Shigeru Harada, Tokyo-to, JP;
Mamoru Sudo, Kanagawa-ken, JP;
Fumiharu Ishii, Tokyo-to, JP;
Kabushiki Kaisha Toshiba, Tokyo, JP;
Abstract
Data on inspection, diagnosis, repair and operation histories are entered in a plant-maintenance apparatus for equipment that constitute a plant to be maintained. Failure-event tree breakdown is performed on failures to be expected for the equipment. Unreliability is predicted of at least one starting item in the failure-event tree breakdown. Unreliability of each item in the failure-event tree is calculated based on a failure unreliability function. Unreliability and a cost of recovery from each failure event in the failure-event tree are multiplied and results of the multiplication are accumulated in accordance with the tree breakdown to obtain a recovery cost. Preventive maintenance expenses are calculated for preventing failure events. Maintenance timing and technique are decided through comparison between the recovery cost and the preventive maintenance expenses.