Nihon Parkerizing Co., Ltd.
135Patents
39Active
135Granted
47Portfolio score
Filing activity: Feb 9, 1978 → Jul 7, 2020 · 8 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6420437B1 | Titanium oxide colloidal sol and process for the preparation thereof | Chemistry; Metallurgy | 33 | Expired |
| US5496463A | Process and apparatus for composite electroplating a metallic material | Chemistry; Metallurgy | 32 | Expired |
| US4954372A | Metal surface hydrophilicizing process and composition | Chemistry; Metallurgy | 30 | Expired |
| US5116430A | Process for surface treatment titanium-containing metallic material | Emerging Cross-Sectional Technologies | 29 | Expired |
| US5759251A | Titanium dioxide ceramic paint and methods of producing same | Chemistry; Metallurgy | 27 | Expired |
| US4741863A | Alkaline degreasing solution comprising amine oxides | Chemistry; Metallurgy | 27 | Expired |
| US5028906A | Humidity sensor | Physics | 25 | Expired |
| US4830101A | Aluminum heat exchanger and method for producing aluminum heat exchanger | Mechanical Engineering; Lighting; Heating | 25 | Expired |
| US6180177A | Surface treatment composition for metallic material and method for treatment | Chemistry; Metallurgy | 22 | Expired |
| US4857225A | Cleaning chemical for aluminium surface | Chemistry; Metallurgy | 20 | Expired |
| US5928731A | Electrostatic powder spray coating method | Performing Operations; Transporting | 20 | Expired |
| US4368776A | Aluminum heat exchanger | Emerging Cross-Sectional Technologies | 19 | Expired |
| US6248181A | Composition and method for hydrophilic treatment of aluminum or aluminum alloy | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5283131A | Zinc-plated metallic material | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5879816A | Metallic sliding material | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6306226A | Process for surface-treating an aluminum-containing metal | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US7531051B2 | Treating solution for metal surface treatment and a method for surface treatment | Chemistry; Metallurgy | 17 | Expired |
| US5308709A | Process for forming composite film on aluminum or aluminum alloy article surface and resulting product | Emerging Cross-Sectional Technologies | 16 | Expired |
| US4402765A | Method and apparatus for treating steel sheet structures | Performing Operations; Transporting | 16 | Expired |
| US5378291A | Coating composition for metal | Chemistry; Metallurgy | 16 | Expired |
| US4927472A | Conversion coating solution for treating metal surfaces | Chemistry; Metallurgy | 16 | Expired |
| US6056483A | Powder coating material feeding apparatus | Performing Operations; Transporting | 15 | Expired |
| US4980076A | Fluoride and chromium free acid etchant rinse for aluminum | Chemistry; Metallurgy | 15 | Expired |
| US4749418A | Chromate coating of zinc surfaces | Chemistry; Metallurgy | 14 | Expired |
| US6491883B2 | Air-cleaning photocatalytic filter | Emerging Cross-Sectional Technologies | 14 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.