Showa Denko Assigned Ten Patents

Fluorine-containing ether compound, lubricant for magnetic recording medium and magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,332,686) developed by Fukumoto, Naoya Ichihara, Japan, Yamaguchi, Yuta Kawasaki, Japan, Ito, Naoko Tokyo, Japan, and Murofushi, Katsumi Ichihara, Japan, for “fluorine-containing ether compound, lubricant for magnetic recording medium and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A fluorine-containing ether compound represented by formula (1) shown below. R.sup.4–CH.sub.2–R.sup.3–CH.sub.2–R.sup.2–CH.sub.2–R.sup.1— CH.sub.2–R.sup.2–CH.sub.2–R.sup.3–CH.sub.2–R.sup.4 (1) (In formula (1), R.sup.1 and R.sup.3 represent different perfluoropolyether chains, R.sup.2 represents a linking group containing one or more polar groups, and R.sup.4 represents a terminal group containing two or more polar groups.).”

The patent application was filed on November 24, 2017 (16/470,713).

Magnetic recording medium and magnetic storage apparatus
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,302,349) developed by Hasegawa, Kota Chiba, Japan, and Fukushima, Takayuki Chiba, Japan, for “magnetic recording medium and magnetic storage apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic recording medium includes a substrate, an underlayer disposed above the substrate, and a first magnetic layer disposed above the underlayer. The first magnetic layer has a granular structure including magnetic grains having a L1.sub.0 structure, and grain boundaries. A content of the grain boundaries is in a range of 25 volume percent to 50 volume percent, and the grain boundaries include a chalcogenide-based layered material.”

The patent application was filed on May 20, 2021 (17/325,347).

Magnetic recording medium having magnetic layer with nitride of carbon or hydride of carbon, and magnetic storage apparatus
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,295,775) developed by Hasegawa, Kota Chiba, Japan, and To, Katsuaki Chiba, Japan, for “magnetic recording medium having magnetic layer with nitride of carbon or hydride of carbon, and magnetic storage apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic recording medium includes a nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protection layer that are arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer that are arranged in this order on the orientation control layer. The first magnetic layer has a granular structure including an oxide at grain boundary parts of magnetic grains, and the second magnetic layer is closest to the protection layer among layers within the perpendicular magnetic layer, and includes magnetic grains made of a CoCrPt alloy, and a nitride of carbon or a hydride of carbon.”

The patent application was filed on November 20, 2020 (16/953,894).

Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,279,664) developed by Yagyu, Daisuke, Yamaguchi, Yuta, Fukumoto, Naoya, Kato, Tsuyoshi, Uetake, Shoko, Tomita, Hiroyuki, Miyasaka, Ryuuta, Ito, Naoko, Ota, Ichiro, and Murofushi, Katsumi Tokyo, Japan, for “fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “The present invention relates to a fluorine-containing ether compound represented by Formula (1), R.sup.1–R.sup.2–CH.sub.2–R.sup.3–CH.sub.2–R.sup.4 (1). (In Formula (1), R.sup.1 is an end group including an organic group having at least one double bond or triple bond, R.sup.2 is a divalent linking group bonded to R.sup.1 by etheric oxygen, R.sup.3 is a perfluoropolyether chain, R.sup.4 is an end group having two or three polar groups with each polar group being bonded to different carbon atoms, and the carbon atoms, to which the polar groups are bonded, being bonded to each other via a linking group including carbon atoms to which the polar groups are not bonded.).”

The patent application was filed on January 30, 2017 (16/082,349).

Fullerene compound, lubricant for magnetic recording medium, and magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,261,395) developed by Kato, Tsuyoshi Ichihara, Japan, Watanabe, Kentaro Chiba, Japan, and Ueda, Yasuyuki Yokohama, Japan, for “fullerene compound, lubricant for magnetic recording medium, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “TThe invention provides a fullerene compound; a lubricant that is for a magnetic recording medium and that contains the fullerene compound; and a magnetic recording medium. The fullerene compound is an ionic liquid that is represented by general formula (1) and is formed from a Bronsted acid (H.sub.n1X) and a Bronsted base ([R.sub.2R.sub.3)N–].sub.m1–R.sub.1); wherein one of the Bronsted acid and the Broonsted base contains a group having a fullerene; and the other contains a perfluoroalkyl chain. ##STR00001##.”

The patent application was filed on June 10, 2019 (16/972,813).

Fluorine-containing ether compound, lubricant for magnetic recording media, and magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,261,394) developed by Kato, Tsuyoshi, Yagyu, Daisuke, Fukumoto, Naoya, Nanko, Masaki Ichihara, Japan, Kuritani, Masumi Tokyo,Japan, and Murofushi, Katsumi Ichihara, Japan, for “fluorine-containing ether compound, lubricant for magnetic recording media, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A fluorine-containing ether compound represented by R.sup.1–R.sup.2–CH.sub.2–R.sup.3–CH.sub.2–R.sup.4–R.sup.5 is provided. (R.sup.3 is a perfluoropolyether chain; R.sup.1 and R.sup.5 are each independently any one of an alkyl group that may have a substituent, an organic group having at least one double bond or at least one triple bond, and a hydrogen atom; and –R.sup.2–CH.sub.2–R.sup.3 is represented by Formula (2), and R.sup.3–CH.sub.2–R.sup.4– is represented by Formula (3)) -[A]-[B]–O–CH.sub.2–R.sup.3 (2) R.sup.3–CH.sub.2–O–[C]-[D]- (3) ([A] is represented by Formula (4), [B] is represented by Formula (5), [C] is represented by Formula (6), [D] is represented by Formula (7), and in the formula, a and b are integers of 0 to 2, c is an integer of 2 to 5, d and f are integers of 0 to 2, and e is an integer of 2 to 5, and at least one of b and d in the formula is 1 or more) ##STR00001##.”

The patent application was filed on August 23, 2018 (16/644,586).

Magnetic recording medium, sputtering target, sputtering target manufacturing method, and magnetic storage apparatus
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,244,700) developed by Murofushi, Katsumi, Ishibashi, Yoshitaka, Fukushima, Takayuki, Niwa, Kazuya, Zhang, Lei, Murakami, Yuji, Shibata, Hisato, Yamaguchi, Takehiro, Xu, Chen, Kanbe, Tetsuya, and Shige, Tomoo Chiba, Japan, for “magnetic recording medium, sputtering target, sputtering target manufacturing method, and magnetic storage apparatus.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic recording medium includes a substrate, an underlayer provided on the substrate, and a magnetic layer provided on the underlayer and having a L1.sub.0 structure and a (001) orientation. The magnetic layer has a granular structure in which an organic compound having a methylene skeleton or a methine skeleton is arranged at grain boundaries of magnetic grains.”

The patent application was filed on October 24, 2018 (16/169,065).

Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,225,624) developed by Kato, Tsuyoshi, Yagyu, Daisuke, Fukumoto, Naoya Ichihara,Japan, and Yamaguchi, Yuta Kawasaki, Japan, for “fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A fluorine-containing ether compound represented by Formula (1) is provided, R.sup.1–R.sup.2–CH.sub.2–R.sup.3–CH.sub.2–R.sup.4 (1) (In Formula (1), R.sup.1 is an alkyl group that may have a substituent, R.sup.2 is a divalent linking group bonded to R.sup.1 via an ethereal oxygen, R.sup.3 is a perfluoropolyether chain, and R.sup.4 is an end group which is different from R.sup.1-R.sup.2 and includes two or three polar groups, in which each of the polar groups is bonded to a different carbon atom, and the carbon atoms bonded to the polar groups are bonded to each other via a linking group containing a carbon atom not bonded to the polar groups.).”

The patent application was filed on August 7, 2018 (16/643,989).

Fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,220,649) developed by Fukumoto, Naoya, Yagyu, Daisuke Ichihara,Japan, Yamaguchi, Yuta Kawasaki, Japan, Uetake, Shoko, Kato, Tsuyoshi, Tomita, Hiroyuki, Miyasaka, Ryuuta, and Murofushi, Katsumi Ichihara, Japan, for “fluorine-containing ether compound, lubricant for magnetic recording medium, and magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A fluorine-containing ether compound represented by Formula (1) is provided; R.sup.1–R.sup.2–CH.sub.2–R.sup.3–CH.sub.2–R.sup.4–R.sup.5 (1) (In Formula (1), R.sup.1 and R.sup.5 may be the same as or different from each other and each represents an alkenyl group having 2 to 8 carbon atoms or an alkynyl group having 3 to 8 carbon atoms, R.sup.2 and R.sup.4 may be the same as or different from each other and each represents a divalent linking group having a polar group, and R.sup.3 represents a perfluoropolyether chain, with a proviso that R.sup.1 and R.sup.2 are, and R.sup.4 and R.sup.5 are divided due to the presence of an atom other than the carbon atom such as an oxygen atom).”

The patent application was filed on December 4, 2017 (16/480,464).

Magnetic recording medium utilizing adjacent underlayer and magnetic layer having particular compositions, magnetic storage apparatus, and method of manufacturing magnetic recording medium
Showa Denko K.K., Tokyo, Japan, has been assigned a patent (11,189,313) developed by Nagasaka, Koichi, Fukushima, Takayuki, Zhang, Lei, Xu, Chen, Shibata, Hisato, Yamaguchi, Takehiro, Koyanagi, Hiroshi, and Umemoto, Yuji Chiba, Japan, for “magnetic recording medium utilizing adjacent underlayer and magnetic layer having particular compositions, magnetic storage apparatus, and method of manufacturing magnetic recording medium.“

The abstract of the patent published by the U.S. Patent and Trademark Office states: “A magnetic recording medium includes a substrate, an underlayer provided above the substrate, and a magnetic layer provided on and in contact with the underlayer. The underlayer includes a compound represented by a general formula MgO.sub.(1-x), where x falls within a range of 0.07 to 0.25. The magnetic layer includes an alloy having a L1.sub.0 structure, and the alloy having the L1.sub.0 structure includes one or more elements selected from a group consisting of Al, Si, Ga, and Ge.”

The patent application was filed on January 5, 2021 (17/141,367).