Helmut Gerhard Conrad
52Patents
28h-index
12Co-inventors
81Inventor score
Filing activity: Nov 7, 1994 → Feb 26, 2008
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6782585B1 | Upright vacuum cleaner with cyclonic air flow | Emerging Cross-Sectional Technologies | 267 | Expired |
| US6334234B1 | Cleaner head for a vacuum cleaner | Emerging Cross-Sectional Technologies | 136 | Expired |
| US6261379A | Floating agitator housing for a vacuum cleaner head | Human Necessities | 135 | Expired |
| US6902596B2 | Air flow passage for a vacuum cleaner | Emerging Cross-Sectional Technologies | 125 | Expired |
| US6156102A | Method and apparatus for recovering water from air | Performing Operations; Transporting | 124 | Expired |
| US6482252B1 | Vacuum cleaner utilizing electrostatic filtration and electrostatic precipitator for use therein | Emerging Cross-Sectional Technologies | 119 | Expired |
| US6736873B2 | Air flow passage for a vacuum cleaner | Emerging Cross-Sectional Technologies | 112 | Expired |
| US6129775A | Terminal insert for a cyclone separator | Emerging Cross-Sectional Technologies | 86 | Expired |
| US6740144B2 | Vacuum cleaner utilizing electrostatic filtration and electrostatic precipitator for use therein | Emerging Cross-Sectional Technologies | 78 | Expired |
| US6277278A | Cyclone separator having a variable longitudinal profile | Emerging Cross-Sectional Technologies | 78 | Expired |
| US6238451A | Vacuum cleaner | Emerging Cross-Sectional Technologies | 74 | Expired |
| US6312594A | Insert for a cyclone separator | Emerging Cross-Sectional Technologies | 72 | Expired |
| US6328527A | Prandtl layer turbine | Performing Operations; Transporting | 63 | Expired |
| US6141826A | Center air feed for cyclonic separator | Emerging Cross-Sectional Technologies | 60 | Expired |
| US6168716A | Cyclone separator having a variable transverse profile | Emerging Cross-Sectional Technologies | 59 | Expired |
| US6596046B2 | Cyclone separator having a variable longitudinal profile | Emerging Cross-Sectional Technologies | 56 | Expired |
| US6391095B1 | Air flow passage for a cyclonic separator and vacuum cleaner having same | Emerging Cross-Sectional Technologies | 52 | Expired |
| US6123779A | Pressure based sensing means for adjusting the height of an agitator in a vacuum cleaner head | Human Necessities | 51 | Expired |
| US6309514A | Process for breaking chemical bonds | Emerging Cross-Sectional Technologies | 49 | Expired |
| US6599340B2 | Air flow passage for a cyclonic separator and vacuum cleaner having same | Emerging Cross-Sectional Technologies | 48 | Expired |
| US5630990A | Ozone generator with releasable connector and grounded current collector | Emerging Cross-Sectional Technologies | 46 | Expired |
| US6217635A | Method and apparatus for concentrating a gas using a single stage adsorption chamber | Performing Operations; Transporting | 40 | Expired |
| US6162283A | Method and apparatus for concentrating a gas using a single stage adsorption zone | Performing Operations; Transporting | 38 | Expired |
| US6183641A | Prandtl layer turbine | Performing Operations; Transporting | 31 | Expired |
| US8015659B2 | Air flow passage for a vacuum cleaner | Emerging Cross-Sectional Technologies | 30 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.