Inventor
Masayasu Yamaguchi
Inventor
Saitama, JP
Overview
Patents· 9 as inventor
Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.
C04Bprimary
C04BLime, magnesia21%
G11BInformation storage based on relative movement between record carrier and transducer21%
C08GMacromolecular compounds obtained otherwise than by reactions only involving unsaturated carbon-to-carbon bonds14%
D01FChemical features in the manufacture of artificial filaments, threads, fibres, bristles or ribbons7%
G02BOptical elements, systems or apparatus7%
G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein7%
H04RLoudspeakers, microphones, gramophone pick-ups or like acoustic electromechanical transducers7%
Y10STechnical subjects covered by former uspc cross-reference art collections [xracs] and digests7%
Y10TTechnical subjects covered by former us classification7%
PatentTitleYear
5,648,859'Liquid crystal microprism array, free-space optical interconnector, and optical switch'19975,217,850'Optical recording disk and manufacturing method thereof'19935,087,340'Method of making magneto-optical recording disk'19924,711,861'Sintered aluminum nitride body and method for making'19874,672,046'Sintered aluminum nitride body'19874,650,774'Magnetic head slider material'19874,471,028'Honeycomb core diaphragm'19844,072,664'Aromatic polyamides from N,N\'-bis(p-aminobenzoyl)ethylene diamine'19784,011,203'Aromatic polyamide from piperazine, p-phenylene diamine and terephthaloyl halide'1977Career & activity timeline
Assembled from patent assignee/location history and declaration credentials.
1977–1978Patents assigned to TOYO BOSEKI (2)· patent assignee history
1978Based in Ootsu, JP· patent location history
1984–1993Patents assigned to PIONEER ELECTRONIC CORP (3)· patent assignee history
1984–1993Based in Saitama, JP· patent location history
1987Patents assigned to TDK CORP (3)· patent assignee history
1987Based in Tokyo, JP· patent location history
1987Based in Nihonbashi, JP· patent location history
1997Patents assigned to NIPPON TELEGRAPH & TELEPHONE (1)· patent assignee history
1997Based in Funabashi, JP· patent location history
Inventor activity
Assignee and location history derived from the patent record.
Assignees
| Assignee | Patents | Span |
|---|---|---|
| PIONEER ELECTRONIC CORP | 3 | 1984–1993 |
| TDK CORP | 3 | 1987 |
| TOYO BOSEKI | 2 | 1977–1978 |
| NIPPON TELEGRAPH & TELEPHONE | 1 | 1997 |
Locations
| Location | Patents | Span |
|---|---|---|
| Saitama, JP | 3 | 1984–1993 |
| Tokyo, JP | 2 | 1987 |
| Funabashi, JP | 1 | 1997 |
| Nihonbashi, JP | 1 | 1987 |
| Ootsu, JP | 1 | 1978 |