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:
Sep. 03, 2002
Filed:
Jun. 20, 2000
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
A retainer ring of a polishing head of a CMP apparatus facilitates the removal of contaminants, such as slurry debris, which have found their way into the polishing head. The retainer ring includes an annular ring body, and a plurality of contaminant outlets extending from the inner peripheral surface of the ring body to the outer peripheral surface of the ring body. Inner openings defined at the inner peripheral surface of the ring body and outer openings defined at the outer peripheral surface of the ring body by the contaminant outlets are horizontally elongated slots. Also, each of the contaminant outlets consists of a plurality of inner holes and an outer hole which is joined to the plurality of inner holes. The contaminant outlets occupy at least 30% of the radially innermost peripheral surface along a line extending circumferentially along the surface. The CMP apparatus itself includes a polishing head having such a retainer ring and a washing unit having a nozzle for spraying deionized water through the contaminant outlets of the retainer ring toward an inner space formed in the polishing head.