Keijo Hellgren
21Patents
6h-index
3Co-inventors
62Inventor score
Filing activity: Dec 20, 1976 → Mar 31, 2006
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4658618A | Forming press of the pressure cell type | Emerging Cross-Sectional Technologies | 14 | Expired |
| US4676086A | Press of pressure cell type | Emerging Cross-Sectional Technologies | 12 | Expired |
| US4080139A | Hydraulic press | Performing Operations; Transporting | 11 | Expired |
| US4105388A | Hydraulic press | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4711111A | Forming press mat utilizes trays formed of thin bottom plates and separate annular frames | Emerging Cross-Sectional Technologies | 8 | Expired |
| US4693103A | Forming press of the pressure cell type and a process for changing diaphrams in such a press | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6178796A | Device and method for shaping flat articles | Performing Operations; Transporting | 6 | Expired |
| US4112724A | Transportation units for supporting and moving plate-formed attachment member into and out of a press stand of hydraulic press | Performing Operations; Transporting | 6 | Expired |
| US6439018B1 | Device and method for expansion forming | Performing Operations; Transporting | 4 | Expired |
| US7150177B2 | Hydraulic press with a pressure cell and a method and use for it, whose press body consists of prestressed lamellas | Performing Operations; Transporting | 4 | Expired |
| US7155948B2 | Forming tool | Performing Operations; Transporting | 4 | Expired |
| US4163378A | Hydraulic press | Performing Operations; Transporting | 4 | Expired |
| US7096774B2 | High pressure press, method for operating a high pressure press and use of such a press | Performing Operations; Transporting | 3 | Expired |
| US7155949B2 | Fluid cell press with a gripping arrangement and method and use of the press | Emerging Cross-Sectional Technologies | 3 | Expired |
| US6053224A | Device for pressure treatment of wood | Performing Operations; Transporting | 3 | Expired |
| US7150171B2 | Pressure cell press comprising a tray, and a method for manufacturing said tray | Performing Operations; Transporting | 2 | Expired |
| US6183812A | Method for treatment of wood | Performing Operations; Transporting | 2 | Expired |
| US7127925B2 | Diaphragm support and a method for initial sealing in a pressure cell | Emerging Cross-Sectional Technologies | 1 | Expired |
| US7509827B2 | Device and method for expansion forming | Performing Operations; Transporting | 1 | Expired |
| US7461531B2 | Press plant and a method and use for it with a pressure cell and a divisible tray | Performing Operations; Transporting | 0 | Expired |
| US7320211B2 | Method of exchanging a diaphragm device | Emerging Cross-Sectional Technologies | 0 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.