Movable or removable closures – Thermal releaser or actuator – Fusible closure latch or retainer
Reexamination Certificate
2006-04-18
2006-04-18
Slack, Naoko (Department: 3635)
Movable or removable closures
Thermal releaser or actuator
Fusible closure latch or retainer
C049S001000, C292SDIG065, C292SDIG066, C052S001000, C052S019000, C052S232000, C052S784110
Reexamination Certificate
active
07028431
ABSTRACT:
A fire-resistant, aluminum, cementitious-material-free, insulation-free door adapted to prevent the spread of fire and heat passing therethrough, consists of: a door frame, a door hingedly mounted on the door frame, the door having a bottom wall, a top wall, and side walls, the bottom wall, top wall and side walls enclosing a hollow central core not containing substantial amounts of insulating material, the bottom wall having an outside surface, and the top wall having an outside surface; and a layer of intumescent material on the outside surface of the bottom wall. A heat-activated self-closing mechanism allows the weight of the door to close the door in the vent of fire, by releasing gas from a supporting gas spring.
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Maxam Metal Products Ltd., Model HD Insulated for Horizontal Floor/Ceiling Applications, Aug. 18, 1998.
Carroll Michael J.
Johnson Patrick K.
Tlemcani Jalil
Nystrom, Inc.
Patterson Thuente Skaar & Christensen P.A.
Slack Naoko
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