Method of applying lubricant to magnetic disc
Patent 5820945 Issued on October 13, 1998. Estimated Expiration Date: 
April 1, 2017. 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.
April 1, 2017. 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 ReferencesMethod and device for depositing a lubricant layer to manufacture a magnetic recording medium Patent #: 4920919 InventorsApplicationNo. 831050 filed on 04/01/1997US Classes:427/555, Nonuniform or patterned coating427/130, With post-treatment of coating or coating material427/131, Applying superposed diverse coating or coating a coated base427/346, Movement of work treats coating (e.g., vibrating, tilting, etc.)427/385.5, Resin, resin precursor, rubber, or hardenable oil-containing coating427/407.1, Synthetic resin coating427/596Laser or electron beam (e.g., heat source, etc.)ExaminersPrimary: Pianalto, BernardAttorney, Agent or FirmInternational ClassB05D 003/00AbstractA magnetic disc for a computer disc drive has distinct zones of differing lubricant thickness. A bonded+mobile zone covers a portion of the disc which preferably coincides with the landing zone. A zone of different lubricant thickness, such as lubricant-free, bonded-only or mostly-bonded, covers a different portion of the disc such as over the data zone. After a uniform layer of lubricant is coated over the disc surface, lubricant can be removed from distinct zones by solvent removal over a periphery of the disc and by removal by laser. The lubricant removal from distinct zones can occur either before or after bonding. Multiple lubricant thickness zones may be used, and the lubricant thickness profile over the entire disc can be controlled as desired.Field of SearchWith post-treatment of coating or coating materialApplying superposed diverse coating or coating a coated base Movement of work treats coating (e.g., vibrating, tilting, etc.) Synthetic resin coating Resin, resin precursor, rubber, or hardenable oil-containing coating Nonuniform or patterned coating Laser or electron beam (e.g., heat source, etc.) | |
