Tobacco Users' Appliance Patents (Class 131/329)
- Smoke washing type (Class 131/173)
- Wind or ash guarding or ash receiving (Class 131/174)
- Combined or convertible (Class 131/178)
- Cigar and cigarette holders (Class 131/187)
- Tubes (Class 131/191)
- Foldable or collapsible (Class 131/192)
- Base burner type (Class 131/193)
- Heat exchanging and/or insulating (Class 131/194)
- Supplemental or substitute air inlet (Class 131/198.1)
- Longitudinally divided (Class 131/199)
- Smoke treating (Class 131/200)
- Special smoke passages (Class 131/216)
- Lined or coated (Class 131/219)
- Reversible bowl (Class 131/221)
- Bowl detachable from neck cup (Class 131/222)
- With valve or external passage closure (Class 131/223)
- Tobacco supports (Class 131/224)
- Joints and connections (Class 131/225)
- Bowls (Class 131/226)
- Stems, bits or tips (Class 131/227)
- Materials and compositions (Class 131/230)