Microwave permeable pressure compensating container

Claim 1

A pressure compensating container comprising: a base portion including a bottom member and upwardly projecting sidewalls which terminate at an upper surface, said base portion defining a cavity into which a food product may be positioned; a threaded portion positioned adjacent said upper surface on said upwardly projecting sidewalls of said base portion; a closure lid adapted to mate with said upper surface of said upwardly projecting sidewalls for forming a closure for said cavity; a threaded portion positioned on said closure lid for mating with said threaded portion on said upper surface of said upwardly projecting sidewalls of said base portion for securely retaining said closure lid relative to said base portion; said closure lid including an aperture disposed therein; a valve member operatively positioned for selectively closing said aperture in said closure lid; a bracket secured to said closure lid and being disposed adjacent to said aperture and including a portion spaced a predetermined distance above said closure lid; resilient biasing means operatively positioned between said bracket and said closure lid for selectively retaining said valve member in a closed position relative to said aperture; adjusting means disposed on the top of said bracket portion and in engagement with said resilient biasing means for adjusting the amount of pressure of said resilient biasing means exerted on said valve member, said valve member, said adjusting means and said resilient biasing means forming a resiliently biased pressure regulating valve in operative communication with said cavity to selectively vent said cavity of steam or vapor when microwave radiation or heat is applied thereto; said base portion, said closure lid and said valve member being constructed of a microwave permeable material.