Dorr-Oliver Incorporated
139Patents
0Active
139Granted
42Portfolio score
Filing activity: Aug 17, 1972 → Apr 8, 1997
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US4661455A | Membrane cell culturing device | Chemistry; Metallurgy | 93 | Expired |
| US4914029A | Process for steeping cereals with a new enzyme preparation | Chemistry; Metallurgy | 70 | Expired |
| US5470472A | Rotary drum filter with reciprocating nozzle means | Performing Operations; Transporting | 69 | Expired |
| US5364335A | Disc-decanter centrifuge | Performing Operations; Transporting | 67 | Expired |
| US4301771A | Fluidized bed heat exchanger with water cooled air distributor and dust hopper | Mechanical Engineering; Lighting; Heating | 57 | Expired |
| US5252041A | Automatic control system for diaphragm pumps | Mechanical Engineering; Lighting; Heating | 42 | Expired |
| US5429581A | Wear-resistant tile surfacing for a centrifuge conveyor | Mechanical Engineering; Lighting; Heating | 41 | Expired |
| US4107026A | System and method for electric dewatering of solids suspension | Performing Operations; Transporting | 39 | Expired |
| US4202774A | Flow distributor for fluid bed biological reactor | Emerging Cross-Sectional Technologies | 38 | Expired |
| US4159682A | Fluid bed combustion with predrying of moist feed using bed sand | Emerging Cross-Sectional Technologies | 35 | Expired |
| US4341801A | Ultrafiltration process for the preparation of cream cheese | Human Necessities | 34 | Expired |
| US4054514A | Sedimentation apparatus with flocculating feed well | Performing Operations; Transporting | 32 | Expired |
| US4232614A | Process of incineration with predrying of moist feed using hot inert particulates | Mechanical Engineering; Lighting; Heating | 31 | Expired |
| US4604174A | High flow electrofiltration | Performing Operations; Transporting | 30 | Expired |
| US3967778A | Centrifugal separator | Performing Operations; Transporting | 30 | Expired |
| US4053375A | Process for recovery of alumina-cryolite waste in aluminum production | Emerging Cross-Sectional Technologies | 29 | Expired |
| US4425232A | Flotation separation apparatus and method | Performing Operations; Transporting | 29 | Expired |
| US4067494A | Nozzle type centrifugal machine with improved slurry pumping chambers | Performing Operations; Transporting | 28 | Expired |
| US5368731A | Vacuum assisted slaker classifier | Emerging Cross-Sectional Technologies | 27 | Expired |
| US4602989A | Method and apparatus for determining the zeta potential of colloidal particles | Physics | 27 | Expired |
| US4660779A | Multilayer precision wound filter cartridge | Performing Operations; Transporting | 26 | Expired |
| US4726902A | Cyclone degritter for solids liquids separation | Performing Operations; Transporting | 24 | Expired |
| US4207158A | Electrically augmented vacuum filtration | Performing Operations; Transporting | 23 | Expired |
| US5076890A | Method for pulp quality control and regulation | Emerging Cross-Sectional Technologies | 23 | Expired |
| US4679439A | Method and apparatus for measuring the unsteady sedimentation potential of colloidal particles | Physics | 23 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.