Inventor
Hideki Umehara
Inventor
Yokohama, JP
Overview
14→
Patents
1993–2006
Patent span
General tagging of new technological developments
Primary field (CPC Y)
Patents· 14 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
G11Bprimary
G11BInformation storage based on relative movement between record carrier and transducer36%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests23%
Y10TTechnical subjects covered by former us classification18%
C09BOrganic dyes or closely-related compounds for producing dyes, e.g. pigments10%
C07DHeterocyclic compounds5%
C07FAcyclic, carbocyclic or heterocyclic compounds containing elements other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur, selenium or tellurium5%
H01FMagnets3%
PatentTitleYear
RE038979'Optical information recording medium and composition for optical information recording film'20066,060,606'Dipyrromethene metal chelate compounds'20005,948,593'Optical recording medium'19995,876,820'Optical information recording medium and composition for optical information recording film'19995,855,979'Optical recording medium'19995,750,229'Phthalocyanine compound and optical recording medium containing it'19985,696,758'Optical recording media'19975,672,462'Optical recording medium'19975,658,707'Optical recording media'19975,646,273'Phthalocyanine compound and optical recording medium containing it'19975,633,106'Optical recording media and a method of recording and reproducing information'19975,492,744'Optical information recording medium and composition for optical information recording film'19965,446,142'Phthalocyanine and naphthalocyanine light-absorbing compound and optical recording medium containing same'19955,188,898'Ferromagnetic metal particles and preparation process thereof'1993Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1993–1998Patents assigned to MITSUI TOATSU CHEMICALS (9)· patent assignee history
1993–2006Based in Yokohama, JP· patent location history
1995–2000Patents assigned to YAMAMOTO CHEMICALS INC (7)· patent assignee history
1997–2000Based in Kanagawa, JP· patent location history
1999–2006Patents assigned to MITSUI CHEMICALS INC (5)· patent assignee history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| MITSUI TOATSU CHEMICALS | 9 | 1993–1998 |
| YAMAMOTO CHEMICALS INC | 7 | 1995–2000 |
| MITSUI CHEMICALS INC | 5 | 1999–2006 |
Locations
| Location | Patents | Span |
|---|---|---|
| Yokohama, JP | 11 | 1993–2006 |
| Kanagawa, JP | 3 | 1997–2000 |