Threaded or push-type coupling
US4688831A · kind A · utility
10Cited by
14References
3Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | May 20, 1985 |
| Grant date | Aug 25, 1987 |
| Priority date | — |
| Expiry date | May 20, 2005 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B21/14
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A coupling for hoses, pipe and tubing which allows the simultaneous and independent flow of two or more materials through the coupling having of a male coupling portion with two or more circumferential channels terminating in a coupling and having circumferential steps between each channel, a female portion having a like number of circumferential channels terminating in a stepped coupling portion and a by-pass ring having one fewer channels than the male and female portions and insertable between the male and female portions to separate the flow of material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.