Fire-rated ceiling grid system
United States Patent 3396997
US Patent References:
Dual purpose interlocking beam connectors
- - 3221466
Suspended ceiling structure
- - 3292332
Expansion joint and locking connection for supporting grid systems
- - 3312488
Dual purpose interlocking beam connectors
- - 3221466
Suspended ceiling structure
- - 3292332
Expansion joint and locking connection for supporting grid systems
- - 3312488
Inventors:
Adams, George C.
Publication Date:
08/13/1968
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Export Citation:
Assignee:
ROLLFORM INC
Primary Class:
Other Classes:
52/506.070, 52/476
International Classes:
E04B9/12; E04B9/06