Rolf Engelhard
24Patents
11h-index
7Co-inventors
68Inventor score
Filing activity: Apr 27, 1993 → Aug 2, 2016
Most-cited inventions
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5266215A | Water purification unit | Chemistry; Metallurgy | 127 | Expired |
| US5540848A | Filter retainer for water purification unit | Chemistry; Metallurgy | 96 | Expired |
| US5709799A | Super ozonating water purifier | Chemistry; Metallurgy | 57 | Expired |
| USD714923S1 | Air purifier | General | 43 | Active |
| USD357058S | Water purification unit | General | 35 | Expired |
| US6461520B1 | User-activated ultra-violet water treatment unit | Emerging Cross-Sectional Technologies | 33 | Expired |
| US5942125A | Dental unit water purifier | Human Necessities | 27 | Expired |
| US8066940B2 | Apparatus and method for removing arsenic and inorganic compositions from water | Chemistry; Metallurgy | 21 | Active |
| US8017073B2 | High intensity air purifier | Human Necessities | 19 | Active |
| US6267895A | Catalytic dental water apparatus | Chemistry; Metallurgy | 17 | Expired |
| USD843554S1 | Air purifier | General | 13 | Active |
| US8734724B2 | High intensity air purifier | Human Necessities | 10 | Active |
| US7794608B2 | Apparatus and method for treating water with ozone | Chemistry; Metallurgy | 9 | Active |
| US8066941B2 | Apparatus and method for purifying water in a storage tank | Chemistry; Metallurgy | 8 | Active |
| US8277735B2 | High intensity air purifier | Human Necessities | 7 | Active |
| US8161579B2 | Toilet tank mounted odor eliminator | Fixed Constructions | 5 | Active |
| US9402931B2 | High intensity air purifier | Human Necessities | 5 | Active |
| US7033502B2 | UV lamp supported filter cartridge | Chemistry; Metallurgy | 3 | Expired |
| US9931601B2 | Venturi bypass system and associated methods | Performing Operations; Transporting | 3 | Active |
| US6830686B2 | Filter cartridge support | Chemistry; Metallurgy | 2 | Expired |
| US9855362B2 | High intensity air purifier | Human Necessities | 1 | Active |
| US10449265B2 | High efficiency ultra-violet reactor | Emerging Cross-Sectional Technologies | 1 | Active |
| US9162903B2 | Photo-catalyzing fluid mobilizing system and method | Emerging Cross-Sectional Technologies | 0 | Active |
| US9408937B2 | Photo-catalyzing fluid mobilizing system and method | Emerging Cross-Sectional Technologies | 0 | Active |
Source: USPTO / EPO open patent data. Inventor disambiguation is heuristic; counts are objective bibliographic measures.