Hitachi Engineering Co., Ltd.
199Patents
6Active
199Granted
43Portfolio score
Filing activity: Mar 28, 1978 → Jan 29, 2008 · 6 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4481573A | Shared virtual address translation unit for a multiprocessor system | Physics | 116 | Expired |
| US4928107A | Signal receiving method for a user's device in a global positioning system | Physics | 114 | Expired |
| US5748202A | Image data processor for processing pixel data in block buffer | Physics | 100 | Expired |
| US4523286A | Apparatus for making diagnosis of valve device in turbine system | Emerging Cross-Sectional Technologies | 93 | Expired |
| US4245182A | Excitation control apparatus for a generator | Emerging Cross-Sectional Technologies | 90 | Expired |
| US5046023A | Graphic processing system having bus connection control capable of high-speed parallel drawing processing in a frame buffer and a system memory | Physics | 78 | Expired |
| US4622275A | Fuel cell power plant | Emerging Cross-Sectional Technologies | 67 | Expired |
| US5058114A | Program control apparatus incorporating a trace function | Physics | 67 | Expired |
| US4523272A | Bus selection control in a data transmission apparatus for a multiprocessor system | Physics | 65 | Expired |
| US5051932A | Method and system for process control with complex inference mechanism | Emerging Cross-Sectional Technologies | 64 | Expired |
| US4879502A | Speed control apparatus and method for motors | Electricity | 58 | Expired |
| US4839846A | Apparatus for performing floating point arithmetic operations and rounding the result thereof | Physics | 56 | Expired |
| US5251285A | Method and system for process control with complex inference mechanism using qualitative and quantitative reasoning | Emerging Cross-Sectional Technologies | 55 | Expired |
| US4811269A | Bit slice multiplication circuit | Physics | 51 | Expired |
| US4779210A | Graphic processing apparatus | Physics | 49 | Expired |
| US5011652A | Nuclear power facilities | Emerging Cross-Sectional Technologies | 48 | Expired |
| US4862150A | Graphic pattern processing apparatus | Physics | 47 | Expired |
| US4530050A | Central processing unit for executing instructions of variable length having end information for operand specifiers | Physics | 46 | Expired |
| US6504587B1 | Liquid crystal display device in which the inner frame having sidewall | Physics | 44 | Expired |
| US6198334A | CMOS circuit | Electricity | 42 | Expired |
| US5293558A | Multiplication, division and square root extraction apparatus | Physics | 42 | Expired |
| US5682552A | Data communication adapter and data communication terminal apparatus for performing data transmission and reception between terminals | Physics | 41 | Expired |
| US5203159A | Pressurized fluidized bed combustion combined cycle power plant and method of operating the same | Emerging Cross-Sectional Technologies | 40 | Expired |
| US5025499A | Process control method and control system | Emerging Cross-Sectional Technologies | 40 | Expired |
| US4894768A | Data processing system with coprocessor | Physics | 40 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.