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US 4,489,121 AGranted
Fire-resistant sandwich core assembly
OwnerJohn S. Luckanuckinventor
Life of this patent
Estimating the term…
Abstract
A fire-resistant sandwich core assembly, particularly for a fire door, comprises a central core layer. A protective layer of ceramic fibre board is provided on each of the main faces of the core layer to form a fire-resistant assembly. Stiles, rails, and appropriate facing may be applied to the assembly to provide a finished fire door.
Claims19
A fire-resistant panel assembly comprising:
- a core of high density particle board having a pair of major faces;
- a protective sheet of rigid, high temperature fibre board made from bulk ceramic fibres having an alumina and silica base provided on each of the major faces of the core;
- and a facing sheet provided on the outer surface of each of said protective sheets.
A fire door comprising:
- a core of high density particle board having a pair of major faces;
- a protective sheet of rigid, high temperature, fibre board made from bulk ceramic fibres having an alumina and silica base provided on each of the major faces of the core;
- a facing sheet provided on the outer surface of each of said protective sheets of ceramic fibre board;
- and rails and stiles provided respectively along horizontal and vertical edges of the core between said facing sheets.
1 more element
Dependencies are inferred from the claim text.