US PATENT SUBCLASS 454 / 59
.~.~.~.~ Responsive to position of access door

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


454 /   HD   VENTILATION

49  DF  WORKSTATION VENTILATOR (E.G., HOOD, OFFTAKE, ETC.) {5}
56  DF  .~ Covered workbench chamber (e.g., fume hood, etc.) {2}
57  DF  .~.~ Having air inlet separate from access opening {2}
58  DF  .~.~.~ Including flow adjustment means {1}
59.~.~.~.~ Responsive to position of access door

DEFINITION

Classification: 454/59

Responsive to position of access door:

(under subclass 58) Subject matter wherein the means alters the direction or rate of air flow dependent upon positioning of a closure for the aperture which allows admittance to the task area by the operator.