John A. Ewen
54Patents
32h-index
15Co-inventors
85Inventor score
Filing activity: Jun 6, 1983 → Jun 28, 2007
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5324800A | Process and catalyst for polyolefin density and molecular weight control | Emerging Cross-Sectional Technologies | 531 | Expired |
| US4794096A | Hafnium metallocene catalyst for the polymerization of olefins | Emerging Cross-Sectional Technologies | 494 | Expired |
| US4937299A | Process and catalyst for producing reactor blend polyolefins | Emerging Cross-Sectional Technologies | 459 | Expired |
| US4892851A | Process and catalyst for producing syndiotactic polyolefins | Emerging Cross-Sectional Technologies | 346 | Expired |
| US4530914A | Process and catalyst for producing polyethylene having a broad molecular weight distribution | Emerging Cross-Sectional Technologies | 334 | Expired |
| US5387568A | Preparation of metallocene catalysts for polymerization of olefins | Emerging Cross-Sectional Technologies | 184 | Expired |
| US5155080A | Process and catalyst for producing syndiotactic polyolefins | Emerging Cross-Sectional Technologies | 171 | Expired |
| US4935474A | Process and catalyst for producing polyethylene having a broad molecular weight distribution | Emerging Cross-Sectional Technologies | 167 | Expired |
| US5036034A | Catalyst for producing hemiisotactic polypropylene | Emerging Cross-Sectional Technologies | 125 | Expired |
| US4975403A | Catalyst systems for producing polyolefins having a broad molecular weight distribution | Emerging Cross-Sectional Technologies | 110 | Expired |
| US5416228A | Process and catalyst for producing isotactic polyolefins | Chemistry; Metallurgy | 103 | Expired |
| US5225500A | Process and catalyst for producing syndiotactic polyolefins | Emerging Cross-Sectional Technologies | 100 | Expired |
| US6184326A | Syndiotactic polypropylene | Chemistry; Metallurgy | 97 | Expired |
| US4522982A | Isotactic-stereoblock polymers of alpha-olefins and process for producing the same | Emerging Cross-Sectional Technologies | 90 | Expired |
| US4927797A | Catalyst system for the polymerization of olefins | Emerging Cross-Sectional Technologies | 85 | Expired |
| US4767735A | Catalyst pretreatment process | Emerging Cross-Sectional Technologies | 79 | Expired |
| US5663249A | Catalyst and process for polymerization of olefins | Emerging Cross-Sectional Technologies | 73 | Expired |
| US5633394A | Catalyst compounds for olefin polymerization | Emerging Cross-Sectional Technologies | 70 | Expired |
| US5561092A | Metallocene catalysts with lewis acids and aluminum alkyls | Emerging Cross-Sectional Technologies | 69 | Expired |
| US5334677A | Process for producing syndiotactic polyolefins | Emerging Cross-Sectional Technologies | 68 | Expired |
| US6635779B1 | Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins | Emerging Cross-Sectional Technologies | 66 | Expired |
| US5459117A | Doubly-conformationally locked, stereorigid catalysts for the preparation of tactiospecific polymers | Chemistry; Metallurgy | 64 | Expired |
| US6444833B1 | Metallocene compounds, process for their preparation and their use in catalytic systems for the polymerization of olefins | Emerging Cross-Sectional Technologies | 57 | Expired |
| US5122583A | Efficiency of a pre-polymerized catalyst | Emerging Cross-Sectional Technologies | 56 | Expired |
| US5066738A | Polymerization of olefins with an improved catalyst system using a new electron donor | Emerging Cross-Sectional Technologies | 56 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.