DAICEL CHEMICAL INDUSTRIES, LTD.
1,182Patents
150Active
1,182Granted
48Portfolio score
Filing activity: Nov 28, 1979 → Dec 7, 2011 · 135 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6012659A | Method for discriminating between used and unused gas generators for air bags during car scrapping process | Emerging Cross-Sectional Technologies | 192 | Expired |
| US5559030A | Processes for production of optically active 4-halo-3-hydroxybutyric acid esters | Emerging Cross-Sectional Technologies | 121 | Expired |
| US5093140A | Aqueous bactericide for animal treatment | Human Necessities | 106 | Expired |
| US5977347A | Cellulose acetate propionate | Chemistry; Metallurgy | 97 | Expired |
| US5979460A | Method of producing tobacco filters | Human Necessities | 95 | Expired |
| US5240283A | Air bag type occupant protector | Performing Operations; Transporting | 86 | Expired |
| US5498688A | Two-step process for the preparation of a (co)polycarbonate by transesterification | Performing Operations; Transporting | 82 | Expired |
| US5494992A | (Co)polycarbonate and process for producing the same | Chemistry; Metallurgy | 78 | Expired |
| US5413922A | Process for producing optically active 1,3-butanediol by reduction of 4-hydroxy-2-butanone | Emerging Cross-Sectional Technologies | 76 | Expired |
| US7083962B2 | Carbonyl reductases, polynucleotides comprising DNA encoding the same, methods for producing the same, and methods for producing optically active alcohol utilizing the same | Chemistry; Metallurgy | 76 | Expired |
| US5770301A | Barrier composite films and a method for producing the same | Emerging Cross-Sectional Technologies | 75 | Expired |
| US5625095A | Process for producing high purity acetic acid | Chemistry; Metallurgy | 75 | Expired |
| US5489665A | Process for producing polycarbonate | Chemistry; Metallurgy | 74 | Expired |
| US5863652A | Tobacco smoke filter materials, fibrous cellulose esters, and production processes | Emerging Cross-Sectional Technologies | 69 | Expired |
| US5225277A | Acetate tow having high crimp modulus and manufacturing method thereof | Emerging Cross-Sectional Technologies | 66 | Expired |
| US4308368A | Photosensitive compositions with reaction product of novolak co-condensate with o-quinone diazide | Physics | 64 | Expired |
| US4522984A | Modified epoxy resin and composition | Chemistry; Metallurgy | 63 | Expired |
| US4707187A | Mortar admixture | Chemistry; Metallurgy | 55 | Expired |
| US5947127A | Tobacco filters and method of producing the same | Human Necessities | 54 | Expired |
| US5942320A | Barrier composite films and a method for producing the same | Emerging Cross-Sectional Technologies | 53 | Expired |
| US6177181A | Porous films, process for producing the same, and laminate films and recording sheets made with the use of the porous films | Emerging Cross-Sectional Technologies | 51 | Expired |
| US7109369B2 | Malonic acid monomethyl derivatives and production process thereof | Chemistry; Metallurgy | 51 | Expired |
| US7208621B2 | Malonic acid monomethyl derivatives and production process thereof | Chemistry; Metallurgy | 51 | Active |
| US4500426A | Semipermeable membrane elements | Performing Operations; Transporting | 50 | Expired |
| US5804296A | Cellulose ester compositions and shaped articles | Emerging Cross-Sectional Technologies | 49 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.