Processes Patents (Class 175/57)
- Treating spent or used fluid above ground (Class 175/66)
- Boring by fluid erosion (Class 175/67)
- Anti-agglomeration treatment of gaseous drilling fluid (Class 175/68)
- Combined liquid and gaseous fluid (Class 175/69)
- Plural distinguishable liquids (Class 175/70)
- Gaseous fluid or under gas pressure (Class 175/71)
- Prevention of lost circulation or caving (Class 175/72)