- Underwriters Laboratories Inc.
 - Northbrook - Provider of product safety certification and quality system registration services (ISO 9000, QS-9000, and ISO 14000). - International Engineering Consortium (IEC)
- Chicago - Acts as a bridge between academic institutions and corporations.
- design-engine.com
- Chicago - Providing an online resource for the product development industry.
- Industrial Noise Control, Inc.
- Addison - Providing products and custom systems for controlling noise in industrial and commercial environments.
- Product Design, Inc.
- Downers Grove - Provider of plastic product design, Pro/Engineer surface modelling, Cosmos/M FEA stress analysis, and injection moulds.
- Wiss, Janney, Elstner Associates, Inc.
- Northbrook - Provides problem-solving structural engineering, architectural and materials testing services for buildings, bridges and other structures.
- Chicago Chem Consultants Corp.
- Chicago - Chemical and environmental engineers.
- Flinn & Dreffein Engineering Company
- Northbrook - Engaged exclusively in the design and construction of custom engineered industrial heat processing systems.
- Fitzsimmons and Associates, Inc.
- Chicago - Chemical analytical laboratory providing services to industries for material ID (polymers, adhesives, contaminants, etc.) and problem solving for their quality control.
- Xytel Corporation - The Pilot Plant Company
- Elk Grove Village - Provides complete turn-key services for modular pilot plants and small commercial process units.
- Engineering Systems Inc.
- Aurora - Specializes in forensic engineering and failure analysis.
- Patrick Engineering Inc.
- Lisle - Architecture, engineering and environmental services.
- CTE Engineers
- Chicago
- Aston Metallurgical Services
- Chicago
- Magnetic Inspection Laboratory, Inc.
- Elk Grove Village - Offers metallurgical testing, nondestructive testing, environmental testing, coatings, metal finishing and welding services.
- GSFE Engineering
- Hanover Park - Mechanical engineering design and building of machines, fixtures, components, product design. AutoCAD 14 and Mechanical Desktop. PRO/E PT Modeller
- Bley Engineering
- Elk Grove Village - CNC machining, machine building, and design.
- Unified Engineering, Inc.
- Lombard - Specializes in failure prevention and analysis.
- Shiner+Associates, Inc.
- Chicago - Specialists in attaining optimum acoustical environments.
- RHE AMERICA
- Lisle - Specializes in the design, manufacture, erection, and commissioning of chemical plants for the production of synthetic resins, emulsion polymers, and down stream products.
- Primera
- Chicago - Full service engineering, design, commissioning, and construction management firm.
- Dickerson Engineering Inc.
- Niles - Consulting in electrical engineering, construction administration, and inspections of existing buildings.
- Industrial Cost Engineering
- Darien - Provides a full range of cost estimates from conceptual to detailed.
- Strategic Product Development
- Arlington Heights - Services from research and conceptual development and industrial design through engineering for high volume manufacturing.
- Thermoscan, Inc.
- Elmhurst - Provides infrared imaging services for roof moisture and building energy loss.
- CS2 Design Group
- Elk Grove Village - Quality mechanical & electrical building systems design & evaluation.
- Cadd Services of Chicago
- Chicago - Design and drafting services using AutoCAD, Microstation, and other graphic programs. Specializing in engineering firms.
- WMA Consulting Engineers, Ltd.
- Chicago - Provide full-service mechanical (HVAC), electrical, plumbing and fire protection engineering design services.
- Cal~Rite
- Naperville - Calibration and field repair services of materials testing equipment.
- Meridian Service Group
- Darien - Engineering graphics for production and presentation. They design, detail and prototype projects and then create a 3D illustration suitable for desktop and web publishing.
- Pioneer Technologies, Inc.
- Burr Ridge - Engineering consulting firm specialized in finite element analysis, mould flow analysis, and mould design.
- EGS Technologies
- Bloomingdale - Provides geographic data and consulting services to the mobile telecommunications engineering and marketing industry.
- Lodestone Technologies, Ltd.
- Lincolnwood - Provides consulting, research, and product development services.
- PCM Thermal Solutions, Inc.
- Naperville - Research and development and consulting firm specialized in the design, development, testing, and evaluation of thermal management of engineering systems and components using Phase Change Materials.
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