Hitoshi Hayakawa
45Patents
16h-index
76Co-inventors
84Inventor score
Filing activity: Sep 6, 1988 → Jun 26, 2014
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4902359A | Wear-resistant titanium or titanium-alloy member and a method for manufacturing the same | Emerging Cross-Sectional Technologies | 49 | Expired |
| US6337459B1 | Multi-layered anti-coking heat resisting metal tube and the method for manufacturing thereof | Performing Operations; Transporting | 48 | Expired |
| US6786581B1 | Ink-jet printing apparatus and ink cartridge | Performing Operations; Transporting | 40 | Expired |
| US6036299A | Ink-jet recording apparatus | Performing Operations; Transporting | 38 | Expired |
| US5260724A | Capping device for ink jet printer | Performing Operations; Transporting | 38 | Expired |
| US6338539B1 | Ink jet recording device | Performing Operations; Transporting | 36 | Expired |
| US5382969A | Ink-expelling restoring device and method for ink jet printer | Performing Operations; Transporting | 27 | Expired |
| US7121652B2 | Ink jet recording apparatus and cleaning control method for recording head incorporated therein | Performing Operations; Transporting | 23 | Expired |
| US6846062B2 | Ink jet recording apparatus and cleaning control method for recording head incorporated therein | Performing Operations; Transporting | 22 | Expired |
| US6709088B2 | Inkjet recording apparatus | Performing Operations; Transporting | 21 | Expired |
| US6578949B2 | Ink jet recording device and method of driving and controlling the same | Performing Operations; Transporting | 20 | Expired |
| US6705712B2 | Ink cartridge, ink jet recording device using the same, and method for controlling the cleaning of a recording head of the ink jet recording device | Performing Operations; Transporting | 19 | Expired |
| US6481826B1 | Ink jet recording apparatus, method of discharging ink from capping unit incorporated in the apparatus, and ink composition used with the apparatus | Performing Operations; Transporting | 19 | Expired |
| US6481824B1 | Ink jet recording apparatus and recording head cleaning control method thereon | Performing Operations; Transporting | 18 | Expired |
| US5855699A | Method for manufacturing welded clad steel tube | Chemistry; Metallurgy | 17 | Expired |
| US6305778A | Ink-jet recording apparatus | Performing Operations; Transporting | 16 | Expired |
| US6417488B1 | Internal metal pipe welding apparatus and monitoring system | Performing Operations; Transporting | 15 | Expired |
| US6227661A | Ink-jet printer | Performing Operations; Transporting | 14 | Expired |
| US6886927B2 | Ink-jet printing apparatus and ink cartridge | Performing Operations; Transporting | 11 | Expired |
| US6406123B1 | Capping unit for ink jet recording head incorporated in ink jet recording apparatus and method of manufacturing the same | Performing Operations; Transporting | 10 | Expired |
| US6422680B1 | Ink jet recording apparatus and cleaning control method for the same | Performing Operations; Transporting | 9 | Expired |
| US7449223B2 | Polymerizable liquid crystal composition and optically anisotropic medium | Chemistry; Metallurgy | 9 | Expired |
| US5907336A | Ink jet recording apparatus with ink discharge hole in nonprint region | Performing Operations; Transporting | 8 | Expired |
| US6733958B2 | Material for photo-alignment layer, photo-alignment layer and method of manufacturing the same | Physics | 8 | Expired |
| US7195345B2 | Ink-jet printing apparatus and ink cartridge | Performing Operations; Transporting | 6 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.