Originally posted by: brtspears2
I think I've seen them at least 10 yrs ago with Hot Pockets.
Active containers have microwave interactive films which usually supply surface or focused heat, in addition to that supplied directly to the foods. The microwave susceptor was finalized by a patent granted in 1986 (U.S. patent 4,641,005) to Oscar Seiferth, then vice president of engineering for Austin, MN-based Hormel Inc.