An improved process and apparatus for the treatment of hot substances which must remain excluded from the action of the air until they reach a low temperature

摘要

The Specification as open to inspection under Sect. 91 (3) (a), comprises the following subject-matter:-In the treatment of hot calcium cyanamide in a stream of cooling gas, steam and carbonic acid may be added as reagents to the fine dust in the gas stream, as a result of which urea may afterwards be obtained by the addition of water to the cyanamide. This subject-matter does not appear in the Specification as accepted.