PIERBURG GMBH
🏢 View company profile →204Patents
102Active
204Granted
51Portfolio score
Filing activity: Aug 24, 1983 → Oct 8, 2020 · 29 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5785013A | Electrically driven coolant pump for an internal combustion engine | Mechanical Engineering; Lighting; Heating | 54 | Expired |
| US6321781A | Apparatus for monitoring the valve stroke of an electromagnetically actuated valve | Emerging Cross-Sectional Technologies | 52 | Expired |
| US5417059A | Burner system for detoxification or cleaning the exhaust gases of an internal combustion engine | Emerging Cross-Sectional Technologies | 47 | Expired |
| US4818705A | Method and apparatus for analyzing the composition of the exhaust gas of any internal combustion engine | Physics | 33 | Expired |
| US6036456A | Electrical air pump adapted for being periodically turned on and off and reversed in pumping direction | Mechanical Engineering; Lighting; Heating | 32 | Expired |
| US6293769A | Canned pump with dry rotor compartment | Electricity | 31 | Expired |
| US5975062A | Apparatus and method for periodically cleaning a charcoal canister and for periodically checking leak-tightness of a fuel system of an internal combustion engine | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US5546788A | Method and apparatus for measuring the concentration of solid particles (soot) in the exhaust gases of internal combustion engines | Physics | 25 | Expired |
| US4766865A | Device for determining the position of a crankshaft in relation to the cylinder | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US5701874A | Balanced valve control member for exhaust gas recycling | Mechanical Engineering; Lighting; Heating | 24 | Expired |
| US6213105A | Device for exhaust recycling for an internal combustion engine and method of making same | Mechanical Engineering; Lighting; Heating | 21 | Expired |
| US6494090B1 | Air-mass sensor | Physics | 19 | Expired |
| US5182942A | Process and apparatus for utilization of fuels with alcohol additives for an internal combustion engine | Emerging Cross-Sectional Technologies | 18 | Expired |
| US6443135B1 | Assembly of a valve unit, a combustion air intake and an exhaust gas recirculation unit for an internal combustion engine | Mechanical Engineering; Lighting; Heating | 18 | Expired |
| US5472321A | Fuel pump having an impeller with axially balanced forces acting thereon | Mechanical Engineering; Lighting; Heating | 17 | Expired |
| US7074019B2 | Rotor protector for wet-type rotor pump | Electricity | 15 | Expired |
| US5105663A | Apparatus and method for measuring low fuel level in a fuel tank | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5797727A | Impeller mounting for electrically driven air pump to reduce vibration | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US5144102A | Fluid pressure switch adapted for low fluid pressure and throughputs | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5503185A | Electromagnetic reversing valve | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5996551A | Spring assembly in an engine air throttle control providing rotational blocking when relaxed | Mechanical Engineering; Lighting; Heating | 15 | Expired |
| US5765435A | Apparatus for indicating fuel level in a fuel tank | Physics | 14 | Expired |
| US4940397A | Fuel pump having a pressure chamber vented via a ball valve to the fuel tank | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US7077114B2 | Exhaust gas recirculation system for a combustion engine | Mechanical Engineering; Lighting; Heating | 14 | Expired |
| US5711652A | Electrically driven air pump having a drive motor balanced in situ | Mechanical Engineering; Lighting; Heating | 13 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.