Compact in-line thermostatically controlled electric water heater for use with dental instruments
US5257341A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 19, 1992 |
| Grant date | Oct 26, 1993 |
| Priority date | — |
| Expiry date | Jun 19, 2012 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24H1/142
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A compact, in-line electric water heater is provided for heating water to a temperature suitable for dental operations. The heater includes a cylindrical inner tube containing an electrical heater element and a cylindrical outer tube concentrically spaced therefrom, through which water to be heated is circulated. An inlet and outlet for the water is located at one end of a chamber formed between the tubes. A control thermostat is operatively mounted on an area of the outer tube which is flattened so as to contact the inner tube and is responsive to the temperature of the outer tube. A thermal limiter is also mounted to the outer tube to function as a safety device should the control thermostat malfunction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.