Hatachi Ltd
13Patents
0Active
13Granted
35Portfolio score
Filing activity: Jul 11, 1980 → Aug 2, 1999
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4782037A | Process of fabricating a semiconductor insulated circuit device having a phosphosilicate glass insulating film | Electricity | 40 | Expired |
| US5336046A | Noise reduced centrifugal blower | Mechanical Engineering; Lighting; Heating | 37 | Expired |
| US5441834A | Process for fabricating phase shift mask and process of semiconductor integrated circuit device | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5259038A | Point pattern matching method and system as well as picture recognizing method and system using the same | Physics | 26 | Expired |
| US6191425A | Multicolor fluorescence detection type electrophoretic analyzer | Physics | 24 | Expired |
| US4889471A | Mechanism for prevention of burning of bearing portions in a hermetic type scroll compressor | Mechanical Engineering; Lighting; Heating | 23 | Expired |
| US5391915A | Integrated circuit having reduced soft errors and reduced penetration of alkali impurities into the substrate | Electricity | 15 | Expired |
| US7110548B1 | Cryptographic communication method, encryption algorithm shared control method, encryption algorithm conversion method and network communication system | Electricity | 12 | Expired |
| US5200348A | Method of manufacturing semiconductor device with constant width deep groove isolation | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4354220A | Gas insulated power switch-gear apparatus | Electricity | 9 | Expired |
| US5091667A | D.C. machine of type having permanent magnets with auxiliary poles | Electricity | 4 | Expired |
| US4412253A | Automatic noise removal device for a picture signal | Electricity | 3 | Expired |
| US5278868A | Receiver for quadraphase modulation signals | Electricity | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.