Murayama Naohiro, Okiawa Takao: Acoustic transducer using a piezoelectric polyvinylidene fluoride resin film as the oscillator. Kureha Kagaku Kogyo Kabushiki Kaisha, Sughrue Rothwell Mion Zinn & Macpeak, February 12, 1974: US3792204 (68 worldwide citation)

An electrostatic type, electroacoustic transducer having excellent acoustic characteristics is composed of an piezoelectric film of a polyvinylidene fluorine resin having an electroconductive material on the opposite surfaces of the film.

Murayama Naohiro, Oikawa Takao: Method of measuring vibrations by means of piezoelectric body and the apparatus therefor. Kureha Kagaku Kogyo, Sughrue Rothwell Mion Zinn and Macpeak, September 9, 1975: US3903733 (52 worldwide citation)

Method of measuring mechanical vibrations comprises forming an electric circuit including as its terminals electrodes provided on both sides of a high molecular piezoelectric body, coupling said piezoelectric body entirely or partially to a vibrating body to be measured, and measuring or detecting t ...

Murayama Naohiro, Nakamura Kenichi: Polymer type electroacoustic transducer element. Kureha Kagaku Kogyo Kabushiki Kaisha, Sughrue Rothwell Mion Zinn & Macpeak, March 19, 1974: US3798473 (51 worldwide citation)

A piezoelectric type electroacoustic transducer element having a high sensitivity in a high frequency region is composed of a piezoelectric polymer sheet having on one surface thereof a backing of a material having a larger elasticity (Young's Modulus) and mass than the elasticity and mass of the pi ...

Murayama Naohiro, Oikawa Takao: Method of producing a piezoelectric or pyroelectric element. Kureha Kagaku Kogyo, Sughrue Rothwell Mion Zinn & Macpeak, October 14, 1975: US3912830 (37 worldwide citation)

A piezoelectric and/or pyroelectric element having improved durability is composed of a piezoelectric or pyroelectric polymer film such as a polyvinylidene fluoride film, an under coating of a thermoplastic or thermosetting resin having negligible piezoelectricity or pyroelectricity applied on the s ...

Murayama Naohiro, Oikawa Takao: Process for production of polyvinylidene fluorine resin film. Kureha Kagaku Kogyo Kabushiki Kaisha, Sughrue Rothwell Mion Zinn and Macpeak, April 15, 1975: US3878274 (33 worldwide citation)

Polyvinylidene fluoride resin film having outstanding electric characteristics is produced by uniaxially stretching melt-extruded polyvinylidene fluoride resin sheet having a birefringent index greater than 1.5.times.10.sup.-.sup.3 towards a direction which is different from winding direction employ ...

Murayama Naohiro: Process for producing a porous material of polytetrafluoroethylene. Kureha Kagaku Kogyo Kabushiki Kaisha, October 22, 1974: US3843570 (27 worldwide citation)

A porous material comprising polytetrafluoroethylene and having micropores is obtained by polymerizing a polymerizable monomer capable of forming a thermoplastic resin, which has been adsorbed or attached to fine particles of polytetrafluoroethylene, milling the resulting polymeric mixture of the po ...

Murayama Naohiro, Hashizume Hideyuki: Pyroelectric coordinate input process and apparatus. Kureha Kagaku Kogyo Kabushiki Kaisha, November 13, 1973: US3772518 (24 worldwide citation)

Process and apparatus for coordinate input of the irradiation position of an irradiating light by taking out a signal corresponding to the light irradiated onto the surface of a polymeric film, such as that of polyvinylidene fluoride, having pyroelectric properties in the form of a pyroelectric curr ...

Hamada Akira, Murayama Naohiro: Light processing apparatus.. Kureha Chemical, July 9, 1980: EP0013179-A1 (20 worldwide citation)

Light processing apparatus (20) comprises a piezoelectric high polymeric film (1) supported under tension at least at two opposite ends (2, 3) thereof, at least one pair (8 or 9) of electrodes arranged to produce an electric field (E) across the thickness of the polymeric film and optical means (19) ...


Murayama Naohiro, Katto Takayuki: Method for production of shaped carbon articles. Kureha Kagaku Kogyo Kabushiki Kaisha, Wenderoth Lind & Ponack, December 3, 1974: US3852429 (15 worldwide citation)

Shaped carbon articles can be manufactured by first shaping vinylidene fluoride homopolymer or copolymers of vinylidene fluoride and fluorine-containing olefin with vinylidene fluoride as its principal constituent into desired forms, crosslinking the shaped polymer by a chemical reaction to render i ...