General Mills, Inc.

Paul M Torniainen

Arne H Brauner

John Daugherty

Paul E Di Mario

Gregory J Landis

James Watson

William E Archibald

A thermoformed plastic food container for use in microwave heating. The container includes a bottom, a sidewall and a flange. The sidewall extends upwardly from the bottom, terminating at a top end. The flange extends from the sidewall opposite the bottom and includes a rim section and a return section. The rim section extends radially outwardly from the top end of the sidewall, and is curved in transverse cross-section. With this configuration, the rim section defines a radius in transverse cross-section. Further, an outer surface of the rim section is configured to receive a sealing film. Additionally, the rim section defines, in top plan view, at least one side that is longitudinally curved, preferably forming a convex curve relative to a central axis of the container. The return section extends from the rim section opposite the top end. More particularly, the return section extends generally downwardly relative to the rim section. The compound curve configuration of the flange resists deflection in response to a lifting force imparted at a single point on the flange. Thus, during use whereby a food item is contained with the container and heated, the container will not overtly deflect when a user lifts the container with a single hand.

Microwavable food container with reinforcing flange and sidewall

A cover for a portable food container comprising a cover body and a utensil. The utensil includes a head piece and a handle piece. The head piece and the handle piece are each detachably secured to the cover body and are configured for assembly to each other upon detachment from the cover body to form the utensil. In one preferred embodiment, the handle piece includes a reinforcement for limiting longitudinal bending thereof. In an alternative embodiment, the cover further includes a protective film resealably secured to the cover body.

Portable food container cover with detachable utensil

Microwave cooking tray

Methods of thermal annealing of plastic pieces immediately after hot melt forming are disclosed to accelerate the time required to achieve dimensional stability. The present methods include the essential steps of: (A) forming molten plastic into molded plastic pieces and rapidly cooling to below the melting point of the plastic in a mold to form shaped cooled plastic pieces; (B) immediately thereafter, heating the plastic pieces to a temperature of about 150&deg; to 170&deg; F. (65.5&deg; to 80&deg; C.) to form heated plastic pieces; and, thereafter, (C) cooling the heated plastic pieces to room temperature to form thermally annealed plastic pieces. Tn its product aspect, the present invention resides in physically aged thermoplastic pieces having reduced rates of age shrinkage.

Thermal annealing of plastic pieces

Carton top

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Plymouth, MN, United States of America

Paul M Torniainen