American Patents Development Corp. v. Carbice Corp. of America

SWAN, Circuit Judge (after stating the facts as above).

The patent in suit relates to the refrigeration of perishable products of a sort not to be damaged by excessive freezing, such, for instance, as ice cream, by packing them around a block of solidified carbon dioxide, and inclosing the whole mass in a box or shipping ease. Carbon dioxide (CO2) may exist as a gas, a liquid, or a solid, depending upon the conditions of temperature and pressure to which it is subjected. As a solid it has an excessively low temperature— approximately minus 140 degrees Fahrenheit. When solid carbon dioxide…