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:
Jun. 09, 1998
Filed:
Jun. 18, 1996
Kazuhiko Yamazaki, Kanagawa, JP;
Yamashin Filter Manufacturing Corp., Yokohama, JP;
Abstract
This invention pertains to a filter in general and particularly to a filter for use in filtering hydraulic oil circulating in a hydraulic system provided for a hydraulic machine. The filter is formed in a loop and includes at least two filtering materials having different filtration porosities. Those filtering materials are arranged in the circumferential direction of the loop. Since filtering materials are arranged in the circumferential direction, the filter can be manufactured at the same size as the existing filters so that it can be accommodated in the existing filter cases. Also, since the filter has more than one filtration accuracies, it is capable of catching impurities of various sizes. In operation, most of the liquid to be filtered tends to pass through the less fine filtration martial. Thus, the filter creates a small pressure loss.