Method of producing magnetic disk
Patent 4842618 Issued on June 27, 1989. Estimated Expiration Date: 
June 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
June 7, 2008. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesLeader tape Lap cutting abrasive Leader or trailer tape for a magnetic tape Composite substrate for a thin-film magnetic head Magnetic recording medium Patent #: 4668568 InventorsAssigneeApplicationNo. 07/203098 filed on 06/07/1988US Classes:51/293, MISCELLANEOUS428/143, Particulate matter428/329, Iron oxide or aluminum oxide428/331, Silicic material51/295, IMPREGNATING OR COATING AN ABRASIVE TOOL51/308, Clay, silica, or silicate51/309Metal or metal oxideExaminersPrimary: Lieberman, PaulAssistant: Thompson, Willie J. Attorney, Agent or FirmInternational ClassesB24D 3/34 (20060101)B24D 3/00 (20060101) B24B 37/04 (20060101) B24D 11/00 (20060101) B24B 7/17 (20060101) B24B 7/00 (20060101) G11B 5/84 (20060101) Foreign Application Priority Data1985-11-27 JPAbstractA method of producing a magnetic disk by lapping a magnetic disk medium, comprising the steps of: preparing a lapping tape having an abrasive particle layer provided with abrasive particle clusters and chip pockets formed between adjacent two clusters, each of said clusters having abrasive particles of Al2 O3 or SiC and abrasive particles of diamond, lapping the surface of said magnetic disk medium by using the thus prepared lapping tape. | |
