Electrically insulated envelope heat pipe
US5642776A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Feb 27, 1996 |
| Grant date | Jul 1, 1997 |
| Priority date | — |
| Expiry date | Feb 27, 2016 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
The disclosure is for a heat pipe in the form of a simple foil envelope and a method of constructing such a heat pipe. Two plastic coated metal foil sheets are sealed together on all four edges to enclose a semi-rigid channeled sheet of plastic foam, and the envelope is evacuated and loaded with a suitable quantity of liquid to act as a heat pipe. Despite the use of the essentially poor thermally conductive materials such as the plastic coating on the surface of the casing and the foam plastic for the wick, the apparatus operates well as a heat spreader for an integrated circuit chip placed in contact with the envelope surface. The heat is transferred across the thin plastic coating with only a small temperature differential, and the foam plastic wick with channels efficiently transports condensed liquid back to the heat input location for evaporation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.