HPD, LLC
12Patents
9Active
12Granted
47Portfolio score
Filing activity: Mar 16, 1979 → Mar 21, 2011 · 9 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US5261485A | Slurry distributor | Mechanical Engineering; Lighting; Heating | 28 | Expired |
| US7597144B2 | Process for recovering heavy oil utilizing one or more membranes | Chemistry; Metallurgy | 19 | Active |
| US8147699B2 | Monolith filter apparatus and membrane apparatus, and method using same | Emerging Cross-Sectional Technologies | 16 | Active |
| US7686079B2 | Method for removing silica from evaporator concentrate | Chemistry; Metallurgy | 15 | Active |
| US8052763B2 | Method for removing dissolved solids from aqueous waste streams | Emerging Cross-Sectional Technologies | 15 | Active |
| US7591311B2 | Process for recovering heavy oil | Fixed Constructions | 10 | Active |
| US5174859A | Method for treating mechanical pulp plant effluent | Emerging Cross-Sectional Technologies | 9 | Expired |
| US8047287B2 | Process for recovering heavy oil utilizing one or more membranes | Chemistry; Metallurgy | 8 | Active |
| US7909098B2 | Process for recovering heavy oil utilizing one or more membranes | Chemistry; Metallurgy | 5 | Active |
| US7578345B2 | Process for recovering heavy oil using multiple effect evaporation | Performing Operations; Transporting | 5 | Active |
| US7905283B2 | Process for removing silica in heavy oil recovery | Chemistry; Metallurgy | 4 | Active |
| US4273670A | Apparatus for and method of removing radioactive bottoms from an evaporator | Emerging Cross-Sectional Technologies | 2 | Expired |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.