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:
May. 03, 1994
Filed:
Sep. 07, 1993
Etsuro Nishio, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A method for testing a waterproof casing having a flexible watertight portion having a flexible waterproofing portion, which is compressed to establish a water tight seal, and a stationary watertight portion, in which the watertightness is established by an adhesive, using a test casing to serve as the adjoining element, wherein the flexible waterproofing portion and the test casing together define a closed chamber, and wherein an air pressure change can be effected in the chamber through the test casing. The method includes the steps of establishing a first air pressure in the closed chamber, less than atmospheric pressure, which causes elastic deformation of the flexible waterproofing portion, and subsequently detecting a change in internal air pressure of the closed chamber. The method further includes the steps of establishing a second air pressure in the closed chamber, less than atmospheric pressure, but greater than the first air pressure, which causes a smaller elastic deformation of the flexible waterproofing portion than the first air pressure and, subsequently detecting a change in internal air pressure of the closed chamber.