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. 22, 2011
Filed:
Dec. 07, 2009
Tsuyoshi Imamura, Sagamihara, JP;
Kyohta Koetsuka, Fujisawa, JP;
Yoshiyuki Takano, Hachioji, JP;
Masayuki Ohsawa, Atsugi, JP;
Hiroya Abe, Yokohama, JP;
Mieko Terashima, Isehara, JP;
Noriyuki Kamiya, Yamato, JP;
Masaki Watanabe, Kawasaki, JP;
Shigeharu Nakamura, Atsugi, JP;
Tsuyoshi Imamura, Sagamihara, JP;
Kyohta Koetsuka, Fujisawa, JP;
Yoshiyuki Takano, Hachioji, JP;
Masayuki Ohsawa, Atsugi, JP;
Hiroya Abe, Yokohama, JP;
Mieko Terashima, Isehara, JP;
Noriyuki Kamiya, Yamato, JP;
Masaki Watanabe, Kawasaki, JP;
Shigeharu Nakamura, Atsugi, JP;
Ricoh Company, Ltd., Tokyo, JP;
Abstract
A method of manufacturing a hollow body having an external surface randomly provided with a large number of depressions is provided. The method includes providing the large number of depressions on the external surface of the hollow body. A profile curve of the external surface in a circumferential direction is obtained while rotating the hollow body. A frequency analysis is performed on the obtained profile curve. A quality of the hollow body is judged by comparing a result of the frequency analysis with a predetermined judgment standard.