Tonen Chemical Corporation
51Patents
6Active
51Granted
39Portfolio score
Filing activity: Jan 31, 1991 → Dec 12, 2008 · 6 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5556671A | Artificial snow in an aggregate form of snow granules | Emerging Cross-Sectional Technologies | 250 | Expired |
| US5922492A | Microporous polyolefin battery separator | Emerging Cross-Sectional Technologies | 54 | Expired |
| US5436039A | Artificial snow in an aggregate form of snow granules | Emerging Cross-Sectional Technologies | 46 | Expired |
| US6001934A | Process for the preparation of a functional group-containing polyarylene sulfide resin | Chemistry; Metallurgy | 46 | Expired |
| US5609947A | Laminated non-woven fabric filtering medium and method for producing same | Emerging Cross-Sectional Technologies | 45 | Expired |
| US6245272A | Polyolefin microporous film and method for preparing the same | Emerging Cross-Sectional Technologies | 45 | Expired |
| US6566012B1 | Polyolefin microporous film and method for preparing the same | Emerging Cross-Sectional Technologies | 40 | Expired |
| US5621046A | Polypropylene resin composition | Chemistry; Metallurgy | 39 | Expired |
| US5342920A | Process for the preparation of polyarylene sulfide and an apparatus for the preparation thereof | Performing Operations; Transporting | 33 | Expired |
| US6153133A | Method of producing highly permeable microporous polyolefin membrane | Performing Operations; Transporting | 33 | Expired |
| US6235432A | Thin non-protonic electrolytic film, immobilized liquid-film conductor, and polymer cell | Emerging Cross-Sectional Technologies | 30 | Expired |
| US5830554A | Method of producing of microporous polyolefin membrane | Emerging Cross-Sectional Technologies | 28 | Expired |
| US5786396A | Method of producing microporous polyolefin membrane | Emerging Cross-Sectional Technologies | 27 | Expired |
| US5789533A | Polyarylene sulfide, a process for the preparation thereof and a composition comprising the same | Chemistry; Metallurgy | 26 | Expired |
| US5177043A | .alpha.-olefin polymerization catalyst component | Emerging Cross-Sectional Technologies | 26 | Expired |
| US6666969B1 | Microporous polyolefin film and process for producing the same | Emerging Cross-Sectional Technologies | 26 | Expired |
| US5853633A | Method of producing microporous thermoplastic resin membrane | Emerging Cross-Sectional Technologies | 25 | Expired |
| US5384172A | Multi-layer plastic fuel tank | Emerging Cross-Sectional Technologies | 25 | Expired |
| US5091435A | Cross-linkable, foamable polyolefin resin composition | Emerging Cross-Sectional Technologies | 24 | Expired |
| US5777069A | Method of maufacturing a tubular extrusion molding product comprising a high molecular weight polyarylene sulfide | Emerging Cross-Sectional Technologies | 20 | Expired |
| US6824865B1 | Microporous polyolefin film and process for producing the same | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5227233A | Polyethylene label and method of preparation thereof | Emerging Cross-Sectional Technologies | 16 | Expired |
| US5475081A | Process for controlling a particle size of polyarylene sulfide and polyarylene sulfide thus produced | Chemistry; Metallurgy | 14 | Expired |
| US6887944B2 | Modified polypropylene and process for producing same | Chemistry; Metallurgy | 11 | Expired |
| US5880198A | Thermoplastic resin composition comprising propylene elastomer, and talc components | Chemistry; Metallurgy | 10 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.