TOYO KOHAN CO., LTD.
269Patents
118Active
269Granted
49Portfolio score
Filing activity: May 28, 1974 → Sep 6, 2023 · 26 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4729789A | Process of manufacturing an extruder screw for injection molding machines or extrusion machines and product thereof | Performing Operations; Transporting | 46 | Expired |
| US5935323A | Articles with diamond coating formed thereon by vapor-phase synthesis | Chemistry; Metallurgy | 35 | Expired |
| US4445998A | Method for producing a steel lithographic plate | Emerging Cross-Sectional Technologies | 31 | Expired |
| US9080692B2 | Steel sheet used to manufacture pipe and having corrosion-resistant properties against fuel vapors, and pipe and fuel supply pipe that use same | Emerging Cross-Sectional Technologies | 23 | Active |
| US6238783A | Thermoplastic resin coated aluminum alloy sheet, and method and apparatus for production thereof | Emerging Cross-Sectional Technologies | 22 | Expired |
| US7183190B2 | Semiconductor device and fabrication method therefor | Electricity | 22 | Expired |
| US4388158A | Acidic tinplating process and process for producing an iron-tin alloy on the surface of a steel sheet | Chemistry; Metallurgy | 21 | Expired |
| US4169916A | Steel sheets and method of treating steel sheets | Emerging Cross-Sectional Technologies | 20 | Expired |
| US3999952A | Sintered hard alloy of multiple boride containing iron | Chemistry; Metallurgy | 19 | Expired |
| US4086153A | Method of producing a composite coated steel sheet | Chemistry; Metallurgy | 19 | Expired |
| US6444348B1 | Battery sealing plate coated with protective film and battery sealed with the same | Emerging Cross-Sectional Technologies | 19 | Expired |
| US4194900A | Hard alloyed powder and method of making the same | Chemistry; Metallurgy | 17 | Expired |
| US4517255A | Method for production of metal sheet covered with polyester resin film | Emerging Cross-Sectional Technologies | 17 | Expired |
| US6257267A | Safety valve element for capacitor and capacitor case lid with safety valves | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4145263A | Steel sheet useful in forming foodstuff and beverage cans | Chemistry; Metallurgy | 16 | Expired |
| US4366185A | Metal-resin composite and process for its production | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5544517A | Method of redrawing a predrawn coated metal can | Performing Operations; Transporting | 16 | Expired |
| US6497978B1 | Explosion-proof safety valve assemblage for a secondary battery | Emerging Cross-Sectional Technologies | 15 | Expired |
| US4614691A | Method for production of metal sheet covered with polyester resin film | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5993994A | Surface treated steel sheet for battery containers, a battery container, and a battery produced thereof | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5585177A | Metal sheet laminated with triple layered thermoplastic resin and a method for production thereof | Emerging Cross-Sectional Technologies | 14 | Expired |
| US6017599A | Laminated sheet and manufacturing method thereof | Emerging Cross-Sectional Technologies | 13 | Expired |
| US7078172B1 | Substrate activation kit and method for detecting DNA and the like using the same | Physics | 13 | Expired |
| US6531242B1 | Enclosed cell and sealer | Emerging Cross-Sectional Technologies | 13 | Expired |
| US5234516A | Method for production of a polyethylene laminated metal sheet | Performing Operations; Transporting | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.