Fume hood exhaust terminal having an ultrasonic motor drive actuator
US6059260A · kind A · utility
5Cited by
12References
7Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 24, 1998 |
| Grant date | May 9, 2000 |
| Priority date | — |
| Expiry date | Apr 24, 2018 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24F13/1426
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
A fume hood exhaust terminal for controlling gas flow in an exhaust duct has an electrically powered ultrasonic motor driven actuator for angularly positioning a damper in the terminal. The circuitry of the terminal includes a power failure detection circuit which includes the capability of storing sufficient power to place the damper in a preferred position until power is restored to the exhaust terminal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.