Patents by Inventor Tetsu Yamamuro
Tetsu Yamamuro 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).
-
Patent number: 4954534Abstract: An organosilicon compound having general formula (I) ##STR1## wherein R.sup.1 represents fluorine; l is an integer of 1 to 5; R.sup.2 represents a lower alkyl group, a lower unsaturated alkyl group or an aromatic group, R.sup.3, R.sup.4, R.sup.5 and R.sup.6 each represent hydrogen, halogen, an alkyl group, an aryl group, a nitro group, a cyano group, and an alkoxyl group, which may be the same or different; m is an integer of 0 to 2, when m is 2, each R.sup.2 may be the same or different; and n is an integer of 1 to 3, provided that m+n is not more than 3 (m+n.ltoreq.3), and a photopolymerizable epoxy resin composition prepared by mixing an epoxy resin component, the above photodecomposing organosilicon compound, and an aluminum compound are disclosed.Type: GrantFiled: July 15, 1988Date of Patent: September 4, 1990Assignee: Ricoh Company, Ltd.Inventor: Tetsu Yamamuro
-
Patent number: 4915997Abstract: An optical information recording medium is disclosed which comprises a pair of substrates at least one of which has a recording layer on one side thereof and which are placed opposingly to each other so that said recording layer is positioned on the inside and are bonded to each other by adhesive layer(s) with or without spacer(s) therebetween to form a sealed structure, wherein said adhesive layer is composed of a cured adhesive material formed from (a) an epoxy resin, (b) a photolyzable organosilicon compound and (c) an aluminum complex compound, said photolyzable organosilicon compound being a silicon compound having at least one phenyl group which has at least one fluorine atom and at least one o-nitrobenzyloxy group which may have a substituent.Type: GrantFiled: October 3, 1988Date of Patent: April 10, 1990Assignee: Ricoh Company, Ltd.Inventors: Tetsu Yamamuro, Yutaka Ueda, Eiji Noda
-
Patent number: 4891305Abstract: This invention relate to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of compounds expressed by the general formula (I), (II), (III) and (IV): ##STR1## (wherein in the above formulas, A, B, D and E represent a substituted or non-substituted aryl group; R.sub.1 to R.sub.8 may be the same or different and represent hydrogen atom, halogen atom or alkyl group; Y represents a divalent residue having atomic groups necessary for forming a five-membered ring or six-membered ring; m, n and l represents 0, 1 or 2; ans X.sup.Type: GrantFiled: July 7, 1988Date of Patent: January 2, 1990Assignee: Ricoh Co., Ltd.Inventors: Hideaki Oba, Tsutomu Sato, Masaakira Umehara, Yutaka Ueda, Tetsu Yamamuro, Michiharu Abe
-
Patent number: 4865949Abstract: An optical information recording medium is disclosed, which comprises a pair of disc-shaped substrates, at least one of the substrates having a recording layer comprising an organic dye compound on one side thereof, which are disposed so as to face each other, with the recording layer positioned therebetween, with or without a space between the two substrates, by sealing with an adhesive agent comprising an alicyclic epoxy resin component having general formula ##STR1## where R.sup.1 .about.R.sup.9 each represent hydrogen, an alkyl group having 1 to 4 carbon atoms, or halogen; and R represents (CH.sub.2).sub.n, where n is an integer of 1 to 4, ##STR2## and a composite catalyst comprising a photo-decomposition organic silicon compound and a metal complex.Type: GrantFiled: April 20, 1988Date of Patent: September 12, 1989Assignee: Ricoh Company, Ltd.Inventors: Tetsu Yamamuro, Yutaka Ueda
-
Patent number: 4758499Abstract: This invention relates to an optical information recording medium, characterized by having an organic thin film recording layer containing at least one of triaryl methane type coloring matters expressed by the general formula (1), (2) or (3): ##STR1## (wherein, in the above formulas (1) and (2), Ar.sub.1, Ar.sub.2 and Ar.sub.3 may be the same or different and represent a substituted or non-substituted arylene group, at least one pair of optical two nitrogen atoms bonded with said arylene groups being connected by an atomic chain having at least ten carbon atoms in total number in the shortest way; R.sub.1, R.sub.2, R.sub.3, R.sub.4, R.sub.5, R.sub.6 and R.sub.Type: GrantFiled: September 5, 1986Date of Patent: July 19, 1988Assignee: Ricoh Co., Ltd.Inventors: Michiharu Abe, Tsutomu Sato, Hideaki Oba, Masaakira Umehara, Yutaka Ueda, Tetsu Yamamuro
-
Patent number: 4711798Abstract: An optical information recording medium comprising a pair of substrates, with a recording layer comprising an organic dye being formed on one side of at least one substrate, fixed to each other through or without through a spacer and by an adhesive agent, in such a manner that the recording layer comes between the substrates, the adhesive agent comprising a compound of formula (I), ##STR1## wherein .phi. represents ##STR2## (l=0 or 1) or ##STR3## in which R represents a methyl group or an ethyl group, m is an integer of 1 to 4, and n is an integer of 2 to 4; and a compound of formula (II), ##STR4## wherein n is an integer of 4 to 8, to which a compound of formula (III) may be added, ##STR5## wherein L represents --CH.sub.2 CH.sub.2 O.sub.m (m=1 to 4) or --CH.sub.2 C(OH)HCH.sub.2 O--, R.sup.1 represents --C.sub.n H.sub.2n+1 (n=4 to 12), R.sup.2 represents Cl or Br (n=0, 1 or 2).Type: GrantFiled: December 16, 1986Date of Patent: December 8, 1987Assignee: Ricoh Company, Ltd.Inventors: Yutaka Ueda, Tetsu Yamamuro
-
Patent number: 4700203Abstract: An ink jet head for compressing ink in an ink chamber to eject a drop of the ink from a nozzle. Ink compressing means for compressing the ink in the ink chamber by expanding and contracting in response to a voltage applied thereto is made of a piezoelectric high molecular substance. The ink compressing means comprises a single thin film of polyvinylidene fluoride (PVDF) or two PVDF films bonded together in a bimorph structure. The thin film is curved inwardly toward the ink chamber. Multiple nozzles are arranged in a predetermined direction. The PVDF film expands and contracts in a direction parallel to the direction of arrangement of the multiple nozzles.Type: GrantFiled: February 24, 1986Date of Patent: October 13, 1987Assignee: Ricoh Co., Ltd.Inventors: Tetsu Yamamuro, Kyuhachiro Iwasaki
-
Patent number: 4607267Abstract: An optical ink jet head for an ink jet printer irradiates a photochemically reactive substance by an active electromagnetic wave to generate gas so that ink is ejected by the pressure of the gas. In optical communications, optical signals transmitted by optical fibers are directly used to drive an ink jet head to eject ink drops complementary to the optical signals from ink ejection nozzles of the head.Type: GrantFiled: December 13, 1984Date of Patent: August 19, 1986Assignee: Ricoh Company, Ltd.Inventor: Tetsu Yamamuro
-
Patent number: 4588998Abstract: An ink jet head for compressing ink in an ink chamber to eject a drop of the ink from a nozzle. Ink compressing means for compressing the ink in the ink chamber by expanding and contracting in response to a voltage applied thereto is made of a piezoelectric high molecular substance. The ink compressing means comprises a single thin film of polyvinylidene fluoride (PVDF) or two PVDF films bonded together in a bimorph structure. Multiple nozzles are arranged in a predetermined direction. The PVDF film expands and contracts in a direction parallel to the direction of arrangement of the multiple nozzles.Type: GrantFiled: July 26, 1984Date of Patent: May 13, 1986Assignee: Ricoh Company, Ltd.Inventors: Tetsu Yamamuro, Kyuhachiro Iwasaki