Inventor

TOHMA KIYOKAZU

JP35 patents

Patents

35 patents

US6347016B1Feb 12, 2002

Master information carrier, process for producing the carrier, and method and apparatus for recording master information signal on magnetic recording medium by using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD292 citations98

US6529341B1Mar 4, 2003

Magnetic recording/reproduction device using preformat information

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD67 citations96

US6606208B2Aug 12, 2003

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD18 citations92

US6567227B2May 20, 2003

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD14 citations92

US6242085B1Jun 5, 2001

Magnetic recording medium and method for producing the same

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD30 citations92

US5851660ADec 22, 1998

Method of fabricating a thin-film magnetic recording medium and thin-film magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD19 citations92

US6466385B1Oct 15, 2002

Method and apparatus of forming a magnetic disk with a servo sector and a data sector on a spiral track

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD25 citations90

US6611388B1Aug 26, 2003

Master information magnetic recorder

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD15 citations84

US6858328B1Feb 22, 2005

Master information support

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD15 citations83

US6961196B2Nov 1, 2005

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD9 citations82

US6606209B2Aug 12, 2003

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD11 citations82

US6898032B2May 24, 2005

Method and apparatus for magnetic printing

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD6 citations74

US5691008ANov 25, 1997

Magnetic recording media fabrication method

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD11 citations74

US5679410AOct 21, 1997

Continuous fabrication of thin film magnetic recording medium with vacuum deposition

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD17 citations74

US5665460ASep 9, 1997

Magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD7 citations74

US5569523AOct 29, 1996

Magnetic recording medium having a ferromagnetic thin film in which 70% to 90% of the total magnetic particles have residual magnetization vectors within ±10° of the easy axis direction

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD8 citations74

US5534324AJul 9, 1996

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD4 citations73

US6587290B2Jul 1, 2003

Master information carrier, method for producing the carrier, and method apparatus for writing information into magnetic record medium using the carrier

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD5 citations73

US5679166AOct 21, 1997

Magnetic recording media, magnetic recording media fabrication method, and fabrication equipment

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD2 citations63

US5554440ASep 10, 1996

Magnetic recording medium and method for producing the same

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD6 citations63

US5549936AAug 27, 1996

Manufacturing method of magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD2 citations63

US5458914AOct 17, 1995

Method for producing magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD3 citations63

US5427869AJun 27, 1995

Magnetic recording medium and method for producing the same

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD2 citations63

US5298282AMar 29, 1994

Production of magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD5 citations63

US5202149AApr 13, 1993

Method for making a magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD5 citations62

US4999220AMar 12, 1991

Method for manufacturing perpendicular magnetic recording medium

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD5 citations59

US4859501AAug 22, 1989

Method for providing a perpendicular recording medium for use with a ring-shaped recording and reproducing head

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD3 citations58

US6909565B2Jun 21, 2005

Magnetic transfer method and magnetic transfer apparatus

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD0 citations52

US5433999AJul 18, 1995

Magnetic recording medium comprising specific backcoat layer

MATSUSHITA ELECTRIC INDUSTRIAL CO LTD0 citations41

TOHMA KIYOKAZU

Patents

Master information carrier, process for producing the carrier, and method and apparatus for recording master information signal on magnetic recording medium by using the carrier

Magnetic recording/reproduction device using preformat information

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

Magnetic recording medium and method for producing the same

Method of fabricating a thin-film magnetic recording medium and thin-film magnetic recording medium

Method and apparatus of forming a magnetic disk with a servo sector and a data sector on a spiral track

Master information magnetic recorder

Master information support

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

Method and apparatus for magnetic printing

Magnetic recording media fabrication method

Continuous fabrication of thin film magnetic recording medium with vacuum deposition

Magnetic recording medium

Magnetic recording medium having a ferromagnetic thin film in which 70% to 90% of the total magnetic particles have residual magnetization vectors within ±10° of the easy axis direction

Magnetic recording medium and method for producing the same

Method and apparatus for producing magnetic recording medium

Magnetic recording medium and method for producing the same

Method of producing thin film

Master disc and method for manufacturing magnetic disc using the same

Master information medium and method of master information recording

Master information carrier, method for producing the carrier, method and apparatus for writing information into magnetic record medium using the carrier

Master information carrier, method for producing the carrier, and method apparatus for writing information into magnetic record medium using the carrier

Magnetic recording media, magnetic recording media fabrication method, and fabrication equipment

Magnetic recording medium and method for producing the same

Manufacturing method of magnetic recording medium

Method for producing magnetic recording medium

Magnetic recording medium and method for producing the same

Production of magnetic recording medium

Method for making a magnetic recording medium

Method for manufacturing perpendicular magnetic recording medium

Method for providing a perpendicular recording medium for use with a ring-shaped recording and reproducing head

Magnetic transfer method and magnetic transfer apparatus

Magnetic recording medium comprising specific backcoat layer