Ken, "jade" sure is a flattering term for the washed-out green plastic of the filter pans.
Greg is right, once the rubber nubs wore down, there was a great loss of stimulation, I mean gripping, yes that's the word, of the filter pan and when the FilterFlo water poured into the pan from the spout at the 12 o'clock position, the pan tipped backward, letting some of the water run out over the side wall. There were also a couple of metal filter pan designs. The earlier and more basic design just had straight side walls. The more deluxe had side walls that terminated in a flat rim that read General Electric FilterFlo.
Abandoned filter pans can be cleaned up and used as carousel-type organizers in cabinets and on the work bench. The plastic turns easily on wood and laminate surfaces. One size I use easily accommodates Bigelow tea boxes and some seasoning containers of varying sizes and the side wall keeps things from falling when the pan is lifted for cleaning.