Karl Hehl
174Patents
20h-index
8Co-inventors
83Inventor score
Filing activity: May 15, 1974 → Dec 21, 2010
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4380427A | Compact hydraulic drive for die closing unit of injection molding machine | Performing Operations; Transporting | 46 | Expired |
| US4846664A | Hydraulic system for the mold clamping unit of a plastics injection molding machine | Performing Operations; Transporting | 40 | Expired |
| US4473346A | Mechanism for the attachment of interchangeable molds in an injection molding machine | Performing Operations; Transporting | 40 | Expired |
| US4565116A | Hydraulic speed controls for die closing unit of injection molding machine | Performing Operations; Transporting | 38 | Expired |
| US5052910A | Clamping unit for injection molding machine | Performing Operations; Transporting | 38 | Expired |
| US5539650A | Knowledge based method of controlling an injection molding machine | Emerging Cross-Sectional Technologies | 37 | Expired |
| US5129806A | Hydraulic system in an injection molding machine | Performing Operations; Transporting | 36 | Expired |
| US5945046A | Process for regulating the tool inner pressure curve of a cyclically working machine | Performing Operations; Transporting | 32 | Expired |
| US4544340A | Attachment mechanism for interchangeable injection molding dies | Performing Operations; Transporting | 32 | Expired |
| US4995801A | Injection molding machine provided with a conveyor for delivering molding from the machine | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4690436A | Pipe coupling | Mechanical Engineering; Lighting; Heating | 27 | Expired |
| US4386626A | Proportional valve for hydraulic systems | Emerging Cross-Sectional Technologies | 25 | Expired |
| US4518338A | Injection molding machine with mold changing and mold preconditioning device | Performing Operations; Transporting | 24 | Expired |
| US4558916A | Multi-pin plug connection system for electronic control unit | Electricity | 24 | Expired |
| US3973888A | Die closing unit for injection molding machine with molding die having multiple transfer sections | Performing Operations; Transporting | 24 | Expired |
| US4671764A | Latching device for injection molding dies | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4462783A | Mechanism for exchanging molding dies in an injection molding machine | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4678572A | Vented cover assembly with filter insert for fluid reservoir | Performing Operations; Transporting | 21 | Expired |
| US4105385A | Compact die closing unit for injection molding machines | Performing Operations; Transporting | 20 | Expired |
| US5916501A | Process for regulating or controlling an injection molding machine | Performing Operations; Transporting | 20 | Expired |
| US3936262A | Multi-orifice injector nozzle for injection molding machine | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4021181A | Tie rod connection for die closing unit of injection molding machine | Emerging Cross-Sectional Technologies | 18 | Expired |
| US3974857A | Device for monitoring and adjusting the temperature of multiple cooling circuits | Emerging Cross-Sectional Technologies | 18 | Expired |
| US4629410A | Dual-hopper injection unit for injection molding machine | Performing Operations; Transporting | 17 | Expired |
| US4680002A | Injection molding machine | Performing Operations; Transporting | 17 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.