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:
Dec. 30, 2003
Filed:
Jun. 13, 2002
Toru Horiuchi, Higashimurayama, JP;
Kenji Shinozaki, Koshigaya, JP;
SMC Kabushiki Kaisha, Tokyo, JP;
Abstract
The real mass flow rate is calculated for a variety of gases. The variety of gases are classified into a plurality of classifications, and representative discharge coefficient relationships are previously determined for the respective classifications. When an upstream pressure and a temperature are detected for a certain gas on an upstream side of the sonic nozzle, a theoretical mass flow rate is calculated. After the theoretical mass flow rate is calculated, reference is made to a theoretical mass flow rate-discharge coefficient correspondence table recorded in a memory corresponding to the classification of the gas, to determine a discharge coefficient based on the relationship appropriate for the gas type. After the discharge coefficient is selected, a real mass flow rate is determined as a product of the determined discharge coefficient and the theoretical mass flow rate.