Kenichi Kawakami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: A laminated, heat-sealable, three-layer film superior in sealability and difficult to burst even under a reduced pressure when sealed as a bag is provided.The laminated three-layer film is characterized in that a base layer (A) which is a biaxially oriented film formed of a crystalline polypropylene, a cushion layer (B) which is a film of an olefin polymer lower in melting point than the base layer (A), and a heat-sealing layer (C) which is an olefin polymer film, are laminated in the order of (A)/(B)/(C) and have surface orientation degrees falling under the following ranges, and that when the cushion layer (B) and the heat-sealing layer (C) are of the same composition, the degree of surface orientation of the cushion layer (B) is smaller than that of the heat-sealing layer (C):2.0.ltoreq.P.sub.A .ltoreq.15.00.ltoreq.P.sub.B .ltoreq.3.52.0.ltoreq.P.sub.C .ltoreq.4.0where,P.sub.A : degree of surface orientation of the base layer (A)P.sub.B : degree of surface orientation of the cushion layer (B)P.sub.
Abstract: A magnetic recording material which comprises a film of a polyester and a magnetic layer formed on at least one side of said film, said polyester containing more than 85 mol % of the repeating unit represented by the formula below and having an intrinsic viscosity of 0.3 to 1.4, and said film of said polyester having a refractive index ratio of 0.935 to 0.975 in the thickness direction and a density index of 0.02 to 0.08. ##STR1## (where X is a halogen atom selected from fluorine, chlorine, and bromine, or an alkyl group of carbon number 1 to 3; and l and m are an integer of 1 to 2, p is an integer of 2 to 6, and q is an integer of 2 to 4.)Although the magnetic recording material is extremely thin, it exhibits outstanding running performance and electromagnetic conversion characteristics. It makes it possible to miniaturize the magnetic tape cassette and extend the recording time. It is useful for long-time video tape and portable 8-mm video tape.