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. 27, 1997
Filed:
Nov. 20, 1995
Tokyo Gas Co., Ltd., Tokyo, JP;
Abstract
There is provided a liquid injection apparatus for use in a method of lining the internal surface of a pipe. The apparatus comprises a push car having a frame structure, a liquid tank for storing a necessary amount of liquid to be injected into the pipe, a liquid pump for pumping the necessary amount of liquid so as to inject the liquid into the pipe, and a liquid injection controlling device for controlling the pressure of the liquid being supplied through the liquid pump, for stopping the liquid injection after a predetermined amount of liquid has been injected into the pipe, and for stopping the liquid injection if the liquid pressure in the pipe changes beyond a predetermined range. The liquid tank, the liquid pump and the liquid injection controlling device are installed together in the push car so as to be easily movable.