Parmelee, Johnson, Bollinger & Bramblett
Content indicating dispenser utilizing displacement of the center of gravity of the contents and the dispenser to provide an indication of the quantity of contents remaining in the dispenser
 A dispenser is designed to provide a visual indication whenever the remaining quantity of contents to be dispensed is less than a predetermined amount. The dispenser is particularly suitable for dispensing vaporizable material such as room deodorants or insecticides. The dispenser is made of lightweight plastic material and has internal space to hold the vaporizable material and air openings for permitting the material to slowly dissipate into the surroudning environment. It is designed, however, to be physically unstable in the absence of a predetermined weight of the vaporizable material. Thus, when the dispenser is full, or partially full, it will stand up, but when the vaporizable material is almost depleted, that is, below the predetermined weight, the dispenser will not stand and falls over, indicating to the user that either a refill is needed or the dispenser must be replaced. The dispenser includes a housing and a supporting base. The housing contains the vaporizable material to be dispensed and has air outlets through which the vapors can pass. The structure of the housing is such that when the weight of the material contained therein is less than a predetermined weight, the center of gravity of the housing and the contents is not above the supporting base, but when the weight of the contents is greater than the predetermined value, the center of gravity of the housing and the contents is shifted above the supporting base. 
B A
B65D A61L
additional inventional
Stanley I.
Mason, Jr.