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:
May. 01, 1990
Filed:
Sep. 05, 1989
Takeo Matsudaira, Tokyo, JP;
Hisanori Suzuki, Tokyo, JP;
Hoya Corporation, Tokyo, JP;
Abstract
In depositing a lubricant layer on a protection layer of a magnetic base, a lubricant is vaporized in a hollow space which is kept at a predetermined temperature under ambient pressure. The predetermined temperature is between 100.degree. C. and 300.degree. C. in consideration of the material of the protection layer and the vapor pressure of the lubricant. Preferably, the vaporization of the lubricant is carried out in a thermostatic chamber which defines a hollow space divided by a mesh partition into upper and lower chambers. The magnetic base and the lubricant are placed in the upper chamber with the lubricant held in a boat while a heater is disposed in the lower chamber.