• All sections
• F - Mechanical engineering; lighting; heating; weapons; blasting
• F28F - Details of heat-exchange or heat-transfer apparatus, of general application
• F28F 1/22 - Tubular elements or assemblies thereof with means for increasing heat-transfer area, e.g. with fins, with projections, with recesses the means being only outside the tubular element and extending longitudinally the means having portions engaging further tubular elements

Patent holdings for IPC class F28F 1/22

Total number of patents in this class: 113

10-year publication summary

Principal owners for this class