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:
Oct. 19, 2010
Filed:
May. 24, 2007
Akio Furuse, Tokyo, JP;
Akio Furuse, Tokyo, JP;
Cosmo Instruments Co., Ltd., Tokyo, JP;
Abstract
In a calibration mode, an equilibrium period after pressurized gas is sealed in a device under inspection and a reference tank is divided into two periods; pressure-difference changes ΔPand ΔPare measured when a first-half equilibrium period of duration Telapses and when a second-half equilibrium period of duration Telapses, respectively; and a pressure-difference change ΔPgenerated in an inspection period of duration Tis measured. A pressure-difference change CTgenerated for duration Tfrom when a period of time in which the influence of an adiabatic change seems to become sufficiently stable elapses is measured. A drift correction coefficient K is calculated from these measured values using K=(ΔPCT)/(ΔPP), is stored in a storage section, and is used in an inspection mode.