Plastic and nonmetallic article shaping or treating: processes – Vacuum treatment of work – To degas or prevent gas entrapment
Patent
1983-10-31
1986-05-06
Anderson, Philip
Plastic and nonmetallic article shaping or treating: processes
Vacuum treatment of work
To degas or prevent gas entrapment
4222, 4227, 4DIG9, 264109, 264129, 422 37, 424149, 424153, B29B 784, B27N 302, E03D 902, A61L 216
Patent
active
045870691
ABSTRACT:
A process for producing a color display means of the type used for detecting the depletion of a cleaning and disinfecting ingredient in a solution such as the water present in a toilet tank and bowl. The display means comprises a solid composition which includes a color indicator in a matrix, and this composition is located in the solution along with the cleaning and disinfecting ingredient. The cleaning and disinfecting ingredient has a bleaching tendency relative to the color indicator so that a display of color is minimal or non-existent for as long as significant amounts of the ingredient are present. The color indicator will, however, provide a substantial display of color after depletion of the ingredient whereby depletion of the ingredient can be detected. The porosity of the solid composition is maintained within limits to provide a means for controlling the rate of release of the color indicator into the solution. This porosity is controlled by a manufacturing process which minimizes the introduction of air and provides a homogenous blend. The compacting of the solid composition into a cake-like structure is then regulated on a pressure and time basis.
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Anderson Philip
Twinoak Products, Inc.
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