Zimpro/Passavant Inc.
10Patents
0Active
10Granted
31Portfolio score
Filing activity: Jul 6, 1987 → Dec 18, 1989
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4919815A | Two-stage anaerobic/aerobic treatment process | Emerging Cross-Sectional Technologies | 117 | Expired |
| US4810386A | Two-stage wastewater treatment | Emerging Cross-Sectional Technologies | 37 | Expired |
| US4857198A | Process for treatment of water containing volatile and toxic compounds | Emerging Cross-Sectional Technologies | 32 | Expired |
| US4749492A | Process for recovering regenerated adsorbent particles and separating ash therefrom | Chemistry; Metallurgy | 29 | Expired |
| US4897196A | Two-stage batch wastewater treatment | Emerging Cross-Sectional Technologies | 28 | Expired |
| US4976873A | Pulsing portions of a filter cell to extend a filter run | Performing Operations; Transporting | 18 | Expired |
| US4952316A | Continuous aeration-batch clarification wastewater treatment | Emerging Cross-Sectional Technologies | 13 | Expired |
| US4818414A | Slime control for primary filtration systems | Performing Operations; Transporting | 10 | Expired |
| US4812243A | Process for treating caustic cyanide metal wastes | Emerging Cross-Sectional Technologies | 10 | Expired |
| US4983308A | Automatic chemical cleaning of granular medium filters | Performing Operations; Transporting | 1 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.