Herbert Freitag
24Patents
13h-index
21Co-inventors
77Inventor score
Filing activity: Feb 13, 1975 → Sep 6, 1989
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4166612A | Gas spring with means for impeding piston movement away from one terminal position | Mechanical Engineering; Lighting; Heating | 70 | Expired |
| US4072288A | Chair with pneumatically adjustable seat height and back support inclination | Human Necessities | 54 | Expired |
| US4756496A | Continuously adjustable levelling column | Human Necessities | 52 | Expired |
| US4307875A | Self-blocking gas spring released by external force | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US4595182A | Construction assembly | Fixed Constructions | 32 | Expired |
| US3995842A | Pneumatic spring with safety release | Mechanical Engineering; Lighting; Heating | 22 | Expired |
| US4709790A | Continuously adjustable length adjustment device | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US4779845A | Gas spring for motor vehicle with retaining drive for preventing piston rod return toward its operational, outermost position after accident | Emerging Cross-Sectional Technologies | 20 | Expired |
| US4467899A | Cylinder-piston device | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US4030716A | Pneumatic suspension element | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US4323224A | Gas spring with means for impeding piston movement away from one terminal position | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US3930565A | Column of adjustable height | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4944498A | Gas spring | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US4263488A | Pneumatic spring including an electric switch | Mechanical Engineering; Lighting; Heating | 13 | Expired |
| US4310148A | Cylinder-and-piston device | Mechanical Engineering; Lighting; Heating | 12 | Expired |
| USRE29497A | Piston rod seal for adjustable pneumatic spring | General | 11 | Expired |
| US4316098A | Gas spring arrangement operating as an electrical connection | Electricity | 11 | Expired |
| US4651979A | Temperature-compensated gas spring | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US4466514A | Cylinder-piston device | Mechanical Engineering; Lighting; Heating | 10 | Expired |
| US4867317A | Positioning device | Fixed Constructions | 8 | Expired |
| US4281884A | Electrically conductive pneumatic spring | Mechanical Engineering; Lighting; Heating | 8 | Expired |
| US4400600A | Gas spring arrangement operating as an electrical connection | Electricity | 4 | Expired |
| US4098302A | Method of charging pneumatic suspension element | Mechanical Engineering; Lighting; Heating | 3 | Expired |
| US5048647A | Container piston rod unit | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.