• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F28C - Heat-exchange apparatus, not provided for in another subclass, in which the heat-exchange media come into direct contact without chemical interaction
• F28C 3/18 - Other direct-contact heat-exchange apparatus one heat-exchange medium at least being a fluent solid, e.g. a particulate material the heat-exchange medium being a particulate material and a gas, vapour, or liquid the particulate material being contained in rotating drums

Patent holdings for IPC class F28C 3/18

Total number of patents in this class: 4

10-year publication summary

Principal owners for this class