Kiyoshi Sakai
117Patents
22h-index
136Co-inventors
93Inventor score
Filing activity: Aug 6, 1973 → Nov 20, 2019
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4297426A | Electrophotographic element with carbazole hydrazone or anile charge transport compounds | Physics | 129 | Expired |
| US4338388A | Electrophotographic element with a phenyhydrazone charge transport layer | Physics | 76 | Expired |
| US5235618A | Video signal coding apparatus, coding method used in the video signal coding apparatus and video signal coding transmission system having the video signal coding apparatus | Electricity | 73 | Expired |
| US4385106A | Charge transfer layer with styryl hydrazones | Physics | 72 | Expired |
| US4399208A | Electrophotographic photosensitive member | Physics | 57 | Expired |
| US4399207A | Electrophotographic photosensitive member with hydrazone compound | Physics | 52 | Expired |
| US4245021A | Electrophotographic element having charge transport layer | Emerging Cross-Sectional Technologies | 51 | Expired |
| US4387147A | Electrophotographic element containing hydrazone compounds in charge transport layers | Physics | 48 | Expired |
| US6801572B2 | Method and apparatus for image signal encoding | Electricity | 41 | Expired |
| US7453941B1 | Moving pictures encoding method and apparatus for detecting a scene change between fields of an interlaced image | Electricity | 38 | Expired |
| US4064351A | 9-OXO-15 .xi.-HYDROXY-20-ALKYLIDENEPROST-13(TRANS)-ENOIC ACID DERIVATIVES | Chemistry; Metallurgy | 31 | Expired |
| US5844611A | Image coding system which limits number of variable length code words | Electricity | 30 | Expired |
| US4663259A | Electrophotographic photosensitive member and image forming process using the same | Physics | 30 | Expired |
| US4420548A | Electrophotographic member with hydrazone or ketazine compounds | Physics | 28 | Expired |
| US5083504A | Drink extraction apparatus | Human Necessities | 27 | Expired |
| US4554231A | Electrophotographic photosensitive member | Physics | 24 | Expired |
| US5148639A | Surface roughening method for organic electrophotographic photosensitive member | Physics | 24 | Expired |
| US6699195B2 | Electronic blood pressure monitor and blood pressure data processing system | Physics | 24 | Expired |
| US5486439A | Electrophotographic with polycarbonate having charge transporting group | Physics | 24 | Expired |
| US4279981A | Electrophotographic elements containing trisazo compounds | Chemistry; Metallurgy | 24 | Expired |
| US4272598A | Electrophotographic material containing disazo compounds | Chemistry; Metallurgy | 23 | Expired |
| US5114814A | Photosensitive member for electrophotography, image forming method and electrophotographic apparatus using the same | Physics | 23 | Expired |
| US5604337A | Loudspeaker arrangement in television receiver cabinet | Electricity | 20 | Expired |
| US4920022A | Electrophotographic photosensitive member comprising aryl amine charge transport material | Physics | 20 | Expired |
| US4251614A | Novel disazo compounds, process for the preparation of same and application of said disazo compounds and analogues thereof to electrophotographic sensitive materials | Physics | 20 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.