Granville J. Hahn
31Patents
13h-index
12Co-inventors
74Inventor score
Filing activity: Jan 24, 1973 → Dec 19, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4552791A | Plastic container with decreased gas permeability | Emerging Cross-Sectional Technologies | 108 | Expired |
| US4713271A | Foamed polymer tubing | Emerging Cross-Sectional Technologies | 33 | Expired |
| US4478874A | Methods for improving the gas barrier properties of polymeric containers | Emerging Cross-Sectional Technologies | 33 | Expired |
| US4744478A | Plastic closure with unitarily molded, foamed sealing layer | Performing Operations; Transporting | 30 | Expired |
| US4621678A | Heat exchanger apparatus for extruding thermoplastic compositions | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4839969A | Drying method and apparatus | Performing Operations; Transporting | 20 | Expired |
| US4443397A | Multiple-layered sheeting apparatus and process therefor | Performing Operations; Transporting | 18 | Expired |
| US3939236A | Method for blow molding foamed walled plastic open mouthed containers | Emerging Cross-Sectional Technologies | 17 | Expired |
| US4483812A | Valve plate and feedblock design for co-extrusion apparatus and co-extrusion process using same | Performing Operations; Transporting | 15 | Expired |
| US4548570A | Extrusion apparatus for producing thermoplastic pipe | Performing Operations; Transporting | 15 | Expired |
| US4872573A | Plastic closure with barrier coating | Performing Operations; Transporting | 14 | Expired |
| US4483669A | Multiple-layered sheeting apparatus | Performing Operations; Transporting | 14 | Expired |
| US4512943A | Extrusion process for producing thermoplastic pipe | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4496408A | Method for producing biaxially oriented hollow articles | Performing Operations; Transporting | 13 | Expired |
| US4974336A | Drying method | Performing Operations; Transporting | 12 | Expired |
| US4526736A | Process and apparatus for manufacturing flexible foamed articles | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4507071A | Coextrusion apparatus for producing multiple layered thermoplastic pipe | Performing Operations; Transporting | 10 | Expired |
| US4611987A | Apparatus for forming multilayer thermoplastic resin extrusions | Performing Operations; Transporting | 9 | Expired |
| US4879138A | Composition for plastic article with unitarily molded foam layer | Emerging Cross-Sectional Technologies | 9 | Expired |
| US4990233A | Method for retarding mineral buildup in downhole pumps | Fixed Constructions | 8 | Expired |
| US4499041A | Coextrusion process for producing multiple layered thermoplastic pipe | Performing Operations; Transporting | 7 | Expired |
| US4028034A | Method and apparatus for blow molding plastic | Performing Operations; Transporting | 7 | Expired |
| US4469651A | Process for extruding thermoplastic compositions | Emerging Cross-Sectional Technologies | 7 | Expired |
| US4501543A | Rotary extruder | Performing Operations; Transporting | 6 | Expired |
| US4813863A | Rotary extruder with a gear pump | Performing Operations; Transporting | 5 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.