Heat-shrinkable electrofusion fittings and methods
US5988689A · kind A · utility
24Cited by
28References
21Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 26, 1997 |
| Grant date | Nov 23, 1999 |
| Priority date | — |
| Expiry date | Dec 26, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB29K2105/16
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The present invention provides improved heat-shrinkable electrofusion fittings and methods. The fittings are basically comprised of an electrically heatable tubular plastic outer member which is shrinkable when heated to a transition temperature, an electrically heatable tubular plastic inner member positioned within the outer member which has a fusion temperature higher than the transition temperature and an electrically activated induction coil for energizing the inner and outer members.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.