Invention Grant
- Patent Title: Firestopping apparatus with airflow-blocking elements
- Patent Title (中): 带阻气元件的防火装置
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Application No.: US13827714Application Date: 2013-03-14
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Publication No.: US08745944B1Publication Date: 2014-06-10
- Inventor: William J. Feil, III , Andrew H. Tilstra
- Applicant: 3M Innovative Properties Company
- Applicant Address: US MN St. Paul
- Assignee: 3M Innovative Properties Company
- Current Assignee: 3M Innovative Properties Company
- Current Assignee Address: US MN St. Paul
- Agent Kenneth B. Wood
- Main IPC: E04B1/94
- IPC: E04B1/94
Abstract:
A firestopping apparatus including a sleeve with at least one pair of airflow-blocking elements, at least one element of which is movable towards, and away from, the other element.
Information query
IPC分类:
