A microwavable package, comprising a folded package for use in holding a variety of cookable items, such as popcorn, other food products, or other substances, all to be heated within a microwave oven, the package being formed of a polymer material, comprising one or more liners of such laminated material,...http://www.google.es/patents/US4808421?utm_source=gb-gplus-sharePatente US4808421 - Formed polymer film package for microwave cooking
