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. 22, 2011
Filed:
May. 08, 2008
Applicant:
Cheng Feng Lin, Taipei, TW;
Inventor:
Cheng Feng Lin, Taipei, TW;
Assignee:
Unipoint Electric Mfg. Co., Ltd., Taipei, TW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B21D 39/03 (2006.01); B21K 1/18 (2006.01); B23P 15/10 (2006.01); B23P 19/02 (2006.01);
U.S. Cl.
CPC ...
Abstract
A method for manufacturing a piston device, comprises the following steps. Processing a first raw material to form a piston with a top surface and a bottom surface. Processing a second raw material to have the diameter of said second raw material slightly larger than the diameter of said piston. Cutting the second raw material into a plural cylinders. Mounting the annular component on the top surface or the bottom surface through the convex portion. The durability and the life cycle of the piston device can be extended by mounting the annular component onto the piston.