Inventor
TERAKAWA MASARU
JP31 patents
⚠️ This page may combine multiple inventors who share the name “TERAKAWA MASARU”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
SONY CORP
26 patentsUS10748570B2Aug 18, 2020
Magnetic recording medium
SONY CORP13 citations93
US11315594B2Apr 26, 2022
Magnetic recording medium having controlled dimensional variation
SONY CORP6 citations86
US10839847B2Nov 17, 2020
Magnetic recording medium having a dimensional variation
SONY CORP12 citations86
US11031033B2Jun 8, 2021
Magnetic recording medium and cartridge
SONY CORP6 citations84
US10204651B2Feb 12, 2019
Magnetic recording medium having cubic ferrite or e-phase iron oxide magnetic particles
SONY CORP6 citations83
US10923148B2Feb 16, 2021
Magnetic recording medium
SONY CORP12 citations82
US10755841B2Aug 25, 2020
Magnetic powder, method for production thereof, and magnetic recording medium
SONY CORP2 citations73
US11798588B2Oct 24, 2023
Magnetic recording medium
SONY CORP0 citations62
US11749304B2Sep 5, 2023
Magnetic recording medium having controlled dimensional variation
SONY CORP0 citations62
US11574651B2Feb 7, 2023
Magnetic recording medium having -iron oxide-containing particles
SONY CORP0 citations62
US11514941B2Nov 29, 2022
Magnetic recording medium having controlled saturation flux density
SONY CORP0 citations62
US11430477B2Aug 30, 2022
Magnetic recording medium
SONY CORP0 citations62
US11355270B2Jun 7, 2022
Magnetic powder, method for production thereof, and magnetic recording medium
SONY CORP0 citations62
US11270729B2Mar 8, 2022
Magnetic recording medium
SONY CORP0 citations62
US11217277B2Jan 4, 2022
Magnetic recording medium having controlled coercive force ratio
SONY CORP1 citations62
US11205455B2Dec 21, 2021
Magnetic recording medium
SONY CORP0 citations62
US11145328B2Oct 12, 2021
Magnetic recording medium
SONY CORP0 citations62
US11031034B2Jun 8, 2021
Magnetic recording medium having a recording layer including epsilon-iron oxide
SONY CORP1 citations62
US11355145B2Jun 7, 2022
Magnetic recording medium
SONY CORP0 citations61
US10872633B2Dec 22, 2020
Magnetic recording medium, laminate, and flexible device
SONY CORP1 citations60
US12394436B2Aug 19, 2025
Magnetic recording medium
SONY CORP0 citations59
US11521649B2Dec 6, 2022
Method of producing a magnetic powder and method of producing a magnetic recording medium
SONY CORP0 citations57
US11830533B2Nov 28, 2023
Method of producing magnetic powder and method of producing magnetic recording medium
SONY CORP0 citations53
US10839848B2Nov 17, 2020
Magnetic recording medium having cubic ferrite or e-phase iron oxide magnetic particles
SONY CORP0 citations51
US10803897B2Oct 13, 2020
Magnetic recording medium
SONY CORP0 citations51
US11170813B2Nov 9, 2021
Magnetic powder, method of producing the same, and magnetic recording medium
SONY CORP0 citations49
SONY GROUP CORP
5 patentsUS11626128B2Apr 11, 2023
Magnetic recording medium
SONY GROUP CORP2 citations73
US12293780B2May 6, 2025
Magnetic recording medium having a particular specific surface area, magnetic recording and reproducing apparatus, and magnetic recording medium cartridge
SONY GROUP CORP0 citations62
US11551711B2Jan 10, 2023
Cobalt ferrite magnetic powder, method of producing the same, and magnetic recording medium
SONY GROUP CORP0 citations58
US11830532B2Nov 28, 2023
Magnetic recording medium including magnetic layer having magnetic powder, magnetic recording/reproducing device, and magnetic recording medium cartridge
SONY GROUP CORP0 citations52
US12087340B2Sep 10, 2024
Magnetic recording medium
SONY GROUP CORP0 citations49