TOKUYAMA CORPORATION
507Patents
299Active
507Granted
55Portfolio score
Filing activity: Dec 20, 1991 → Mar 15, 2024 · 87 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5621017A | Photochromic composition and method producing photochromic cured product | Physics | 120 | Expired |
| US5473120A | Multilayer board and fabrication method thereof | Electricity | 81 | Expired |
| US5910516A | Process for production of photochromic cured product | Emerging Cross-Sectional Technologies | 72 | Expired |
| US6759449B2 | Dental adhesive composition | Chemistry; Metallurgy | 64 | Expired |
| US5904159A | Polishing slurries and a process for the production thereof | Chemistry; Metallurgy | 55 | Expired |
| US5609675A | Inorganic composition | Chemistry; Metallurgy | 51 | Expired |
| US5629559A | Package for semiconductor device | Electricity | 51 | Expired |
| US5780154A | Boron nitride fiber and process for production thereof | Emerging Cross-Sectional Technologies | 47 | Expired |
| US5776376A | Photochromic curable composition | Chemistry; Metallurgy | 46 | Expired |
| US6146557A | Fire resistant resin composition | Chemistry; Metallurgy | 42 | Expired |
| US5687518A | Window frame having outer frame member made of resin | Emerging Cross-Sectional Technologies | 41 | Expired |
| US5443959A | Method of assaying fibrinogen, dry reagent therefor, and process for the preparation thereof | Emerging Cross-Sectional Technologies | 39 | Expired |
| US5665473A | Package for mounting a semiconductor device | Emerging Cross-Sectional Technologies | 38 | Expired |
| US5556931A | Polymerizable composition and organic glass | Physics | 37 | Expired |
| US6268063A | Propylene resin composition, process for the preparation thereof, and use thereof | Emerging Cross-Sectional Technologies | 36 | Expired |
| US6723859B2 | Chromene compound | Emerging Cross-Sectional Technologies | 35 | Expired |
| US5395566A | Photochromic composition | Physics | 33 | Expired |
| US5445862A | Porous film and process for production thereof | Emerging Cross-Sectional Technologies | 32 | Expired |
| US6878853B2 | Process for preparing dihalogenated adamantanes | Chemistry; Metallurgy | 27 | Expired |
| US5475074A | Polymerizable composition, organic glass and ophthalmic lens | Chemistry; Metallurgy | 25 | Expired |
| US5783271A | Biodegradable alipathic polyster, melt-extrusion film thereof, and process for the production thereof | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5925690A | Dental primer composition and kit | Human Necessities | 23 | Expired |
| US5976481A | Polycrystal silicon rod and production process therefor | Chemistry; Metallurgy | 22 | Expired |
| US5367105A | Process and device for production of allyl chloride | Chemistry; Metallurgy | 22 | Expired |
| US5808100A | Chromene compounds and photochromic materials | Physics | 22 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.