CH2M HILL, INC.
45Patents
16Active
45Granted
44Portfolio score
Filing activity: Dec 28, 1993 → Oct 4, 2017 · 12 expiring within 5 years
Most-cited patents
| Patent | Title | Area | Cited by | Status |
|---|---|---|---|---|
| US6863818B2 | Method and apparatus for treating wastewater using membrane filters | Emerging Cross-Sectional Technologies | 84 | Expired |
| US6517723B1 | Method and apparatus for treating wastewater using membrane filters | Emerging Cross-Sectional Technologies | 80 | Expired |
| US6946073B2 | Method for treating wastewater in a membrane bioreactor to produce a low phosphorus effluent | Emerging Cross-Sectional Technologies | 79 | Expired |
| US6295823A | Apparatus and method for controlling temperature and humidity of a conditioned space | Mechanical Engineering; Lighting; Heating | 55 | Expired |
| US5480548A | Wastewater biological phosphorus removal process | Emerging Cross-Sectional Technologies | 45 | Expired |
| US6905600B2 | Method and apparatus for the treatment of particulate biodegradable organic waste | Emerging Cross-Sectional Technologies | 44 | Expired |
| US7171787B2 | Rectangular tilt-up concrete tank construction | Fixed Constructions | 19 | Expired |
| US7103479B2 | Method and system for evaluating water usage | Human Necessities | 19 | Expired |
| US7062406B2 | Method and system for water quality trading | Physics | 15 | Expired |
| US7138048B1 | Apparatus and method for the removal of solids and floatables from a wastewater stream | Fixed Constructions | 14 | Expired |
| US7754090B1 | Portable ultraviolet water treatment apparatus | Emerging Cross-Sectional Technologies | 12 | Active |
| US6982036B2 | Chemically enhanced primary sludge fermentation method | Emerging Cross-Sectional Technologies | 11 | Expired |
| US5701953A | Well head for environmental extraction wells | Performing Operations; Transporting | 10 | Expired |
| US7311834B2 | Apparatus for the treatment of particulate biodegradable organic waste | Emerging Cross-Sectional Technologies | 10 | Active |
| US7029201B1 | Utility line bedding for storm water management and storm water management system and method | Fixed Constructions | 10 | Expired |
| US6534306B1 | Modular biofilter unit and method of use | Emerging Cross-Sectional Technologies | 9 | Expired |
| US7025884B2 | Method and apparatus for treatment of a fluid system | Chemistry; Metallurgy | 7 | Expired |
| US6728987B1 | Method of adjusting the vertical profile of a cable supported bridge | Fixed Constructions | 7 | Expired |
| US6723244B1 | Method and apparatus to achieve nitrification at low solids retention times | Emerging Cross-Sectional Technologies | 7 | Expired |
| US6783681B2 | Method and apparatus for treatment of drinking water | Performing Operations; Transporting | 7 | Expired |
| US6787041B2 | Carbon dioxide enhanced complex-adsorption process for metal or metalloid removal from water | Chemistry; Metallurgy | 7 | Expired |
| US7000711B2 | Horizontal bore cryogenic drilling method | Fixed Constructions | 7 | Expired |
| US6383803B1 | Portable compostion system with reconfigurable air flow | Emerging Cross-Sectional Technologies | 5 | Expired |
| US6352575B1 | Apparatus and method for centralized recovery of volatile organic compounds | Emerging Cross-Sectional Technologies | 5 | Expired |
| US7968760B2 | Treatment of particulate biodegradable organic waste by thermal hydrolysis using condensate recycle | Chemistry; Metallurgy | 5 | Active |
Source: USPTO / EPO open patent data. Counts and citation impact are objective bibliographic measures.