Acoustic vapor type indicator
US5170634A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 1991 |
| Grant date | Dec 15, 1992 |
| Priority date | — |
| Expiry date | Jun 11, 2011 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF17C2260/044
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An acoustic vapor type indicator is disclosed in which an audible signal such as a whistle is produced when a vapor is flowing through the indicator. The indicator includes an air chamber having an inlet for connection with a closed vessel containing a quantity of a gas other than air. When the closed vessel is open to the indicator, the gases within the vessel first force the air from the air chamber through an outlet orifice producing a whistle of a first pitch. Once the air has been removed and the gas within the closed vessel passes the outlet orifice, due to a change in density the pitch produced by the indicator will be changed. Alternative embodiments disclose automated pitch detection means as well as a pitch recognition device.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.