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. 27, 2012
Filed:
Nov. 19, 2008
Hideki Saito, Osaka, JP;
Toshiro Saeki, Osaka, JP;
Hideki Saito, Osaka, JP;
Toshiro Saeki, Osaka, JP;
Hitachi Zosen Corporation, , JP;
Abstract
A method in which a pressure in an imaginary vacuum container is determined by calculation based on a gas flow rate difference between an estimated discharge gas amount determined from the actual opening degree of a vacuum valve provided on the discharge conduit of a vacuum container and an estimated inflow gas amount determined in the preceding operation period, an estimated inflow gas amount at the present time is determined based on a difference between the calculated pressure and a pressure measured in an actual vacuum container by a pressure meter, a set discharge gas amount is determined by adding, to the estimated inflow gas amount, a correction gas amount obtained based on a pressure deviation between a set pressure and the measured pressure, and the degree of opening of the vacuum valve is controlled such that a discharge gas amount reaches the set discharge gas amount.