Gas: Heating And Illuminating Patents (Class 48)
Acetylene
Generators (Class 48/61)
Retorts (Class 48/119)
Conversion of hydrocarbon gas and blending of product with further hydrocarbon gas, process (Class 48/127.1)
Methane (natural gas) -containing product, or treatment or recovery process (Class 48/127.3)
Apparatus for converting or treating hydrocarbon gas (Class 48/127.9)
Carburetors (Class 48/144)
Purifiers (Class 48/128)
Center and by-pass valves (Class 48/170)
Exhausters (Class 48/173)
Holders (Class 48/174)
Mixers (Class 48/180.1)
Distribution (Class 48/190)
Processes (Class 48/197R)

Foreign Patent Art Collections

Class-related foreign documents (Class 48/FOR000)

Digests

Recirculation of gases produced to lower part of fuel bed (Class 48/DIG1)
Slagging producer (Class 48/DIG2)
High pressure (Class 48/DIG3)
Powdered fuel injection (Class 48/DIG4)
Diffusion membrane for gas reaction or separation (Class 48/DIG5)
Underground gasification of coal (Class 48/DIG6)
Slurry (Class 48/DIG7)
Internal combustion engine for gas making (Class 48/DIG8)
Solar gasification (Class 48/DIG9)
Computer resisted control (Class 48/DIG10)