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. 15, 1987
Filed:
May. 02, 1986
Katsuaki Kuze, Ohtsu, JP;
Yasuhiro Nishino, Tsuruga, JP;
Yujiro Matsuyama, Ohtsu, JP;
Kozo Maeda, Takatsuki, JP;
Masahiro Kobayashi, Kyoto, JP;
Tadashi Okudaira, Tsuruga, JP;
Tsuyoshi Hongo, Ohtsu, JP;
Osamu Makimura, Ogaki, JP;
Toyo Boseki Kabushiki Kaisha, , JP;
Abstract
An oriented polyester film comprising ethylene terephthalate as the major repeating units, which comprises 0.01 to 1.0% by weight of silica particles and/or titanium dioxide particles having each an average particle size of 0.01 to 0.5.mu. and 0.005 to 1.0% by weight of calcium carbonate having an average particle size of 0.01 to 0.5.mu., which provides an oriented polyester film for the base film of video tape which has a flatness on the surface and has excellent slipperiness, abrasion resistance and running characteristics as well as excellent magnetic transducer characteristics.