Patent Explorer
Browse, filter, and analyze 35 patents across global jurisdictions.
| Patent Number | Title | Assignee | Status | Filing Date | Grant Date | Expires | Remaining | Claims | Actions |
|---|---|---|---|---|---|---|---|---|---|
| DE2020830A1 | Interferometric spectrometer | Hitachi Ltd | Expired / Lapsed | 1970-04-28 | — | 1990-04-28 | 0.0 yrs | 0 | |
| EP0046298A1 | Apparatus for measuring a magnetic field | Hitachi Ltd | Expired / Lapsed | 1981-08-17 | — | 2001-08-17 | 0.0 yrs | 9 | |
| EP0044572A1 | Apparatus for measuring the intensity of magnetic fields by an optical fiber | Hitachi Ltd | Expired / Lapsed | 1981-07-23 | — | 2001-07-23 | 0.0 yrs | 6 | |
| US5140453A | Optical receiving method utilizing polarization diversity and apparatus for carrying out the same | Hitachi Ltd | Expired / Lapsed | 1988-03-11 | 1992-08-18 | 2008-03-11 | 0.0 yrs | 18 | |
| US4793359A | Centering balloon structure for transluminal angioplasty catheter | Hitachi Ltd | Expired / Lapsed | 1987-04-24 | 1988-12-27 | 2007-04-24 | 0.0 yrs | 12 | |
| US4709342A | Tactile sensing apparatus | Hitachi Ltd | Expired / Lapsed | 1984-07-31 | 1987-11-24 | 2004-07-31 | 0.0 yrs | 15 | |
| US4410985A | Data transmission system and method | Hitachi Ltd | Expired / Lapsed | 1981-03-25 | 1983-10-18 | 2001-03-25 | 0.0 yrs | 23 | |
| US4354267A | Data transmission system utilizing loop transmission lines between terminal units | Hitachi Ltd | Expired / Lapsed | 1980-05-14 | 1982-10-12 | 2000-05-14 | 0.0 yrs | 10 | |
| US4275321A | Drip-proof type electrical rotating machine | Hitachi Ltd | Expired / Lapsed | 1978-08-23 | 1981-06-23 | 1998-08-23 | 0.0 yrs | 7 | |
| US4239124A | Fluid-tight closure apparatus | Hitachi Ltd | Expired / Lapsed | 1978-10-20 | 1980-12-16 | 1998-10-20 | 0.0 yrs | 18 | |
| US4214305A | Multi-processor data processing system | Hitachi Ltd | Expired / Lapsed | 1978-06-20 | 1980-07-22 | 1998-06-20 | 0.0 yrs | 8 | |
| US4161651A | Simultaneously sampled remote data reading and transmission system using optical fibers | Hitachi Ltd | Expired / Lapsed | 1978-03-02 | 1979-07-17 | 1998-03-02 | 0.0 yrs | 9 | |
| US4136929A | Apparatus for generating light pulse train | Hitachi Ltd | Expired / Lapsed | 1975-11-25 | 1979-01-30 | 1995-11-25 | 0.0 yrs | 53 | |
| US4136384A | Loop type data highway system | Hitachi Ltd | Expired / Lapsed | 1977-03-24 | 1979-01-23 | 1997-03-24 | 0.0 yrs | 6 | |
| US4064484A | Analog-digital converter with variable threshold levels | Hitachi Ltd | Expired / Lapsed | 1976-07-26 | 1977-12-20 | 1996-07-26 | 0.0 yrs | 11 | |
| US4044394A | Thin film magnetic head with a center tap | Hitachi Ltd | Expired / Lapsed | 1976-04-05 | 1977-08-23 | 1996-04-05 | 0.0 yrs | 7 | |
| US3996792A | Supersonic wave flaw detecting apparatus | Hitachi Ltd | Expired / Lapsed | 1975-07-01 | 1976-12-14 | 1995-07-01 | 0.0 yrs | 14 | |
| US3990092A | Resistance element for semiconductor integrated circuit | Hitachi Ltd | Expired / Lapsed | 1975-01-13 | 1976-11-02 | 1995-01-13 | 0.0 yrs | 13 | |
| US3973239A | Pattern preliminary processing system | Hitachi Ltd | Expired / Lapsed | 1974-10-15 | 1976-08-03 | 1994-10-15 | 0.0 yrs | 10 | |
| US3902812A | Photometer using three kinds of light wavelengths | Hitachi Ltd | Expired / Lapsed | 1974-05-20 | 1975-09-02 | 1994-05-20 | 0.0 yrs | 8 |
Showing 1 to 20 of 35 patents
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