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:
Feb. 12, 1980
Filed:
Mar. 13, 1978
Applicant:
Inventor:
Kyuichi Shibasaki, Yokosuka, JP;
Assignee:
Toyo Seikan Kaisha, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01N / ;
U.S. Cl.
CPC ...
73 52 ; 364558 ;
Abstract
A method and apparatus for inspecting the internal pressure of hermetically sealed containers wherein a sound wave of free damped oscillation exicted at the elastic wall of a hermetically sealed container is converted and detected as an electrical signal, analysis is performed for natural self-correlation function of this detected signal by using logical operation circuits, and thus, the adequacy of the internal pressure is discriminated by measuring the period of such function.