Trade magazines, newspapers, and technical literature are excellent places to get ideas or help refine an existing idea.
Technical Literature includes journal articles, conference proceedings, and patents. The three databases listed below are multidisciplinary. Visit the Databases by Subject for more. Patents are also covered under the Intellectual Property page on this guide and in depth at Patents Libguide.
The library has many books on specific products and product development in general. For example, see the following subject heading search for New Products.