Wellman Inc.
🏢 View company profile →75Patents
4Active
75Granted
39Portfolio score
Filing activity: Aug 22, 1984 → Dec 27, 2010 · 4 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5898058A | Method of post-polymerization stabilization of high activity catalysts in continuous polyethylene terephthalate production | Chemistry; Metallurgy | 155 | Expired |
| US5876644A | Food quality polyester recycling | Emerging Cross-Sectional Technologies | 46 | Expired |
| US6590069B2 | Methods of post-polymerization extruder injection in condensation polymer production | Emerging Cross-Sectional Technologies | 42 | Expired |
| US6500890B2 | Polyester bottle resins having reduced frictional properties and methods for making the same | Emerging Cross-Sectional Technologies | 42 | Expired |
| US6569991B2 | Methods of post-polymerization extruder injection in polyethylene terephthalate production | Emerging Cross-Sectional Technologies | 42 | Expired |
| US6803082B2 | Methods for the late introduction of additives into polyethylene terephthalate | Emerging Cross-Sectional Technologies | 41 | Expired |
| US6573359B2 | Methods of post-polymerization injection in condensation polymer production | Emerging Cross-Sectional Technologies | 36 | Expired |
| US6599596B2 | Methods of post-polymerization injection in continuous polyethylene terephthalate production | Emerging Cross-Sectional Technologies | 36 | Expired |
| US6727306B2 | Polymer resins having reduced frictional properties | Emerging Cross-Sectional Technologies | 34 | Expired |
| US6710158B2 | Methods for making polyester bottle resins having reduced frictional properties | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5344026A | Method and apparatus for sorting plastic items | Emerging Cross-Sectional Technologies | 31 | Expired |
| US6752336B1 | Carpet recycling method | Emerging Cross-Sectional Technologies | 30 | Expired |
| US7129317B2 | Slow-crystallizing polyester resins | Performing Operations; Transporting | 27 | Expired |
| US6284866A | Method of preparing modified polyester bottle resins | Emerging Cross-Sectional Technologies | 25 | Expired |
| US5485964A | Method and apparatus for sorting plastic items | Emerging Cross-Sectional Technologies | 21 | Expired |
| US7094863B2 | Polyester preforms useful for enhanced heat-set bottles | Emerging Cross-Sectional Technologies | 19 | Expired |
| US5469973A | Sorting optically different solid masses | Emerging Cross-Sectional Technologies | 18 | Expired |
| US5603413A | Sortation method for transparent optically active articles | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6335422B2 | Method of preparing modified polyester bottle resins | Emerging Cross-Sectional Technologies | 17 | Expired |
| US5227109A | Method for producing multicomponent polymer fibers | Emerging Cross-Sectional Technologies | 17 | Expired |
| US6250060A | Method of producing improved knit fabrics from blended fibers | Textiles; Paper | 17 | Expired |
| US6623853B2 | Polyethylene glycol modified polyester fibers and method for making the same | Emerging Cross-Sectional Technologies | 17 | Expired |
| US6182685A | Injector structure for liquid additives | Emerging Cross-Sectional Technologies | 15 | Expired |
| US6110405A | Melt spinning colored polycondensation polymers | Emerging Cross-Sectional Technologies | 14 | Expired |
| US5970700A | Drafting apparatus and method for producing yarns | Textiles; Paper | 11 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.