Passavant-Werke AG
18Patents
0Active
18Granted
30Portfolio score
Filing activity: Nov 27, 1972 → Dec 5, 1995
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4142970A | Method and apparatus for mechanically and chemically treating liquids | Chemistry; Metallurgy | 32 | Expired |
| US4290898A | Method and apparatus for mechanically and chemically treating liquids | Chemistry; Metallurgy | 32 | Expired |
| US5366622A | Procedure and installation for conditioning and subsequent dewatering of sludge | Chemistry; Metallurgy | 20 | Expired |
| US5338445A | Module for a reactor for anaerobic waste water treatment | Emerging Cross-Sectional Technologies | 15 | Expired |
| US5037559A | Process for conditioning and dewatering sludges | Chemistry; Metallurgy | 13 | Expired |
| US5075012A | Process for dewatering sludges in filter presses | Performing Operations; Transporting | 12 | Expired |
| US5695646A | Process for conditioning soft water to become drinking water | Chemistry; Metallurgy | 11 | Expired |
| US5500118A | Biogas reactor for the anaerobic treatment of waste water | Emerging Cross-Sectional Technologies | 10 | Expired |
| US5190672A | Method for thermal disposal of sewage sludge | Emerging Cross-Sectional Technologies | 9 | Expired |
| US5154830A | Process of removing phosphorus and suspended matter from waste water | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5431808A | Device for odor filtering of exhaust air from waste water treatment | Emerging Cross-Sectional Technologies | 5 | Expired |
| US5194148A | Hydraulic cylinder extension device for a filter press | Performing Operations; Transporting | 3 | Expired |
| US5330660A | Method for evacuating floating sludge from settling tanks and thickener tanks | Emerging Cross-Sectional Technologies | 3 | Expired |
| US5011601A | Filter plates for plate filter presses | Performing Operations; Transporting | 3 | Expired |
| US5045191A | Non-clogging filtrate outlet stopper for use in a plate filter press | Performing Operations; Transporting | 1 | Expired |
| US5160612A | Lifting support frame for a filter press | Performing Operations; Transporting | 0 | Expired |
| US5296142A | Chamber filter press | Performing Operations; Transporting | 0 | Expired |
| US5462663A | Suspension and guidance mechanism for the filter plates of a filter press | Performing Operations; Transporting | 0 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.