Patent ID: 7614298

Claim:
A material amount display for a container for holding material within the interior of the container, the display indicating the amount of the material within the interior of the container when the container is in an upright position, the display comprising: a structure forming a flexible blister adapted to be placed beneath the bottom portion of the container when the container is in an upright position, and to respond to the weight of the container and the material within the container and the material within the container, the flexible blister is substantially circular in form, having a diameter which is less than the diameter of the bottom portion of the container, and having a height which is maximum to the center thereof; an elongated tube being formed of material enabling the interior of the elongated capillary tube to be visible from the outside of the elongated capillary tube, the elongated tube having one end thereof connected to the exterior of the blister, the elongated capillary tube being adapted to extend vertically adjacent to the outside surface of the container with the other end portion of the elongated capillary tube being disposed adjacent to the upper portion of the container at which the upper portion of the material held within the container is disposed when he container is filled with the material and in an upright position; a gel disposed within the interior of the flexible blister and the elongated capillary tube, the gel extending from the blister and through the elongated capillary tube to adjacent to the upper portion of the container when the container is completely filled with the material; when the material within the container is removed in part, the weight of the container at the bottom portion thereof upon the blister is reduced and causes the gel to recede from adjacent to the upper portion of the container, whereby the level of the gel in the elongated capillary tube recedes in height and indicates the change of the amount of the material within the container.