Instantaneous flow-through electric water heater for coffee makers
US4460819A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jan 11, 1983 |
| Grant date | Jul 17, 1984 |
| Priority date | — |
| Expiry date | Jan 11, 2003 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24H1/142
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A flow-through instantaneous electric water heater for coffee percolators has a metal casting with a substantially flat bottom portion formed with a U-shaped trough receiving therein a U-shaped electric heating element. A semi-annular boiling water chamber is formed in the casting between the arms of the U-shaped heating element adjacent the base region of the U and has an inlet and an outlet opening connected, respectively, to water inflow and outflow conduits located adjacent the legs of the heating element. The water inflow conduit has a length at least 1.3 times the length of the average flow path of water flowing through the boiling water chamber or about twice the diameter of the boiling water chamber and is thermally insulated over a major portion of its length from the adjacent heating element leg by an air gap to insure that the temperature of the fresh water flowing into the chamber from the inlet conduit is below the boiling temperature. The thickness of the casting increases toward the base of the U at an inclination angle between 1.5.degree. and 4.degree..
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.