1
Hisao Hachisuka, Kenichi Ikeda: Polyimide semipermeable membrane. Nitto Denko Corporation, Merchant Gould Smith Edell Welter & Schmidt, March 16, 1999: US05882382 (41 worldwide citation)

A polyimide resin semipermeable membrane has a continuous structure of a homogeneous skin layer part having an average thickness of 5-1000 nm and a porous layer that is made of the same materials and has the same thickness as the skin layer. The porous layer is formed by the void structure having th ...


2
Hisao Hachisuka, Kenichi Ikeda: Composite reverse osmosis membrane having a separation layer with polyvinyl alcohol coating and method of reverse osmotic treatment of water using the same. Nitto Denko Corporation, Akin Gump Strauss Hauer & Feld L, January 23, 2001: US06177011 (39 worldwide citation)

A reverse osmosis composite membrane that has a high salt rejection, a high water permeability, and a high fouling tolerance, and permits practical desalination at a relatively low pressure is provided by coating the surface of a reverse osmosis membrane of aromatic polyamide with polyvinyl alcohol ...


3
Hisao Hachisuka, Katsuhide Kojima, Yutaka Nakazono, Mitsuru Shimizu, Masahiko Hirose, Yasuo Kihara, Masatoshi Maeda, Hisashi Ikebata, Kenji Matsumoto: Composite reverse osmosis membrane and novel acid chloride. Nitto Denko Corporation, Sughrue Mion Zinn Macpeak & Seas, August 9, 1994: US05336409 (29 worldwide citation)

A composite reverse osmosis membrane comprising a thin membrane and a microporous supporting membrane supporting it, wherein said thin membrane mainly comprises a crosslinked polyamide comprising; (a) an amine component containing at least one member selected from the group consisting of substantial ...


4
Hisao Hachisuka, Yoshihiko Kondo, Kenichi Ikeda, Hitoshi Takano, Amane Mochizuki: Separation membrane and method of producing the same, and shape memory polymer composition. Nitto Denko Corporation, Merchant Gould Smith Edell Welter & Schmidt P A, June 8, 1999: US05910357 (27 worldwide citation)

A separation membrane and a method of producing the membrane are provided. The membrane can control its permselectivity and its fouled pores can be easily washed by using the reversible shape change of the membrane. For this purpose, porous shape memory polymers are used for the separation membrane.


5
Hisao Hachisuka, Kenichi Ikeda: Reverse osmosis composite membrane and reverse osmosis treatment method for water using the same. Nitto Denko Corporation, Akin Gump Strauss Hauer & Feld L, July 2, 2002: US06413425 (23 worldwide citation)

A reverse osmosis composite membrane comprises a sponge layer, and a separation layer formed on a surface of the sponge layer, wherein at least one substance selected from the group consisting of an electrically neutral organic substance and an electrically neutral polymer is present in the separati ...


6
Takuji Shintani, Hisao Hachisuka, Katsumi Ishii: Spiral wound type separation membrane element. Nitto Denko Corporation, Akin Gump Strauss Hauer & Feld L, May 20, 2003: US06565747 (22 worldwide citation)

A spiral wound type separation membrane element includes a spiral wound type membrane component formed by superposing separation membranes of membrane materials supported on nonwoven fabric members on both surfaces of a permeated liquid passage forming member and bonding three sides with an adhesive ...


7
Hisao Hachisuka, Katsuhide Kojima, Yutaka Nakazono, Masahiko Hirose, Yasuo Kihara, Masatoshi Maeda, Hisashi Ikebata, Kenji Matsumoto: Acid chloride. Nitto Denko Corporation, Sughrue Mion Zinn Macpeak & Seas, April 23, 1996: US05510527 (21 worldwide citation)

An acid chloride, bicyclo[2,2,2]oct-7ene-(2.alpha.,3.beta.,5.alpha.,6.beta.)tetracarbonyl chloride (C.sub.12 H.sub.8 O.sub.4 Cl.sub.4) represented by the following formula: ##STR1##


8
Masaaki Andou, Terutaka Watanabe, Masahiko Hirose, Hisao Hachisuka, Mark Wilf, Craig Bartels, Keith Andes: Method of treating reverse osmosis membrane element, and reverse osmosis membrane module. Nitto Denko Corporation, Hydranatics, Westerman Hattori Daniels & Adrian, November 23, 2004: US06821430 (20 worldwide citation)

In the treatment, a reverse osmosis membrane element having a polyamide skin layer is loaded in a pressure vessel in a membrane separator and contacted with a bromide-containing aqueous solution of free chlorine. The thus treated reverse osmosis membrane element retains for a long time its effect of ...


9
Akira Shimazu, Kenichi Ikeda, Hisao Hachisuka: Method of selectively separating unsaturated hydrocarbon. Petroleum Energy Center, Merchant Gould Smith Edell Welter & Schmidt P A, May 12, 1998: US05749943 (19 worldwide citation)

A homogeneous membrane or an asymmetric membrane which is made of polyimide resin containing fluorine as a main component and has high separation and permeation properties, is used in a method of separating unsaturated hydrocarbon from a mixture of unsaturated and saturated hydrocarbon. The method i ...


10
Hisao Hachisuka, Kenichi Ikeda: Polysulfone semipermeable membrane and method of manufacturing the same. Nitto Denko Corporation, Merchant Gould Smith Edell Welter & Schmidt, March 30, 1999: US05888605 (14 worldwide citation)

The semipermeable membrane of polysulfone resin is formed of a continuous structure of a homogeneous skin layer part having an average thickness of 5 to 1000 nm and a porous layer which is made of the same material as that of the homogeneous skin layer and is thicker than the homogeneous skin layer, ...