Ventilation – Workstation ventilator
Reexamination Certificate
2011-07-19
2011-07-19
McAllister, Steve (Department: 3749)
Ventilation
Workstation ventilator
C454S056000, C454S057000, C454S058000, C454S059000
Reexamination Certificate
active
07980927
ABSTRACT:
A fume hood is described for use in removing material from, or inserting material into, the opening of a container. The fume hood enclosure has a floor with an opening for insertion of the upper end of the container into the enclosure. The floor includes a circumferential groove around the opening, preferably in a raised shoulder. An annular flexible membrane having an inner diameter smaller than the diameter of the opening is placed in axial alignment over the opening and the groove. A vacuum is drawn on the groove through a vacuum port to pull the section of the membrane above the groove into the groove, holding the membrane securely in place during use. If desired, a retainer can be placed in the groove above the membrane to prevent movement of the membrane in the event of a loss of vacuum.
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,MacCord Mason PLLC
Flow Sciences, Inc.
Kosanovic Helena
McAllister Steve
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