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:
Nov. 01, 1977
Filed:
Oct. 06, 1975
Nobuhiko Harada, Shimonoseki, JA;
Minetaka Tanaka, Shimonoseki, JA;
Masanao Shimano, Shimonoseki, JA;
Kyozo Fujinaga, Shimonoseki, JA;
Kunito Nunomura, Shimonoseki, JA;
Masamitu Tamura, Shimonoseki, JA;
Shigeharu Nakamura, Shimonoseki, JA;
Kazuo Akagi, Shimonoseki, JA;
Kobe Steel, Ltd., Kobe, JA;
Abstract
An apparatus and process for etching the inner surface of a pipe or tubular member includes a primary pipe adapted to be connected with a pipe or pipes whose inner surfaces are to be treated, and treating-solution supply pipes communicating, by means of electromagnetic valves, with the aforenoted primary pipe, whereby one path for a specific solution to be fed through one of the treating-solution supply pipes by means of the primary pipe into the pipe to be treated is automatically switched to another path by means of the aforenoted electromagnetic valves, without causing mixing of one solution with another. This apparatus and process therefore provides improved operational efficiency as well as a uniform surface condition and achieves accurate dimensioning for the inner surface of the pipe to be treated.