Smoking tube with check valve
US4031905A · kind A · utility
Inventor
Key dates
| Filing date | Sep 11, 1975 |
| Grant date | Jun 28, 1977 |
| Priority date | — |
| Expiry date | Sep 11, 1995 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA24F1/30
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Quite a large cylindrical tube for a mouthpiece tube and a smaller stem for supporting a small bowl extend upwardly from different portions of a hollow base. The hollow base functions as a reservoir, and the base and the lower portions of the stem and the mouthpiece tube are filled with water. A plastic ball within the mouthpiece tube helps control the draw of the pipe. The plastic ball is the sealing member of the check valve that prevents rapid flow of water from the mouthpiece tube to the stem when inhalation is stopped abruptly. The port of the check valve is a hole that is eccentric within the bottom of the mouthpiece tube. The eccentricity provides a desirable amount of leakage for slowly equalizing the level of water in the mouthpiece tube and the stem.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.