US4489121A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Fire-resistant sandwich core assembly
Assignee: FIREGUARD ARCHITECTURAL DOOR Inc
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Filing: 1983-03-29
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Granted: 1984-12-18
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Expires: 2003-03-29
Abstract
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.
Inventors
- 👤 John S. Luckanuck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 08:16
CPC Classifications
B; B32; B32B; B32B21/00; B32B21/13; B32B19/00; B32B19/04; B32B21/02; E; E06; E06B; E06B5/00; E06B5/10; E06B5/16; B32B2262/00; B32B2262/10; B32B2262/105; B32B2307/00; B32B2307/30; B32B2307/306; B32B2307/3065; B32B2309/00; B32B2309/08; B32B2309/10; B32B2309/105; E06B3/00; E06B3/70; E06B3/7015; E06B2003/7025; E06B2003/7032; Y; Y10; Y10S; Y10S428/00; Y10S428/92; Y10T; Y10T428/00; Y10T428/24; Y10T428/24777; Y10T428/25; Y10T428/253
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
63 words
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.
Claim 2
Dependent Claim
63 words
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.
Claim 3
Dependent Claim
22 words
A panel assembly as claimed in claim 1 wherein each protective sheet is glued to the associated major face of the core.
Claim 4
Dependent Claim
18 words
A panel assembly as claimed in claim 1 wherein the protective sheets are substantially thinner than said core.
Claim 5
Dependent Claim
20 words
A panel assembly as claimed in claim 3 wherein the protective sheets have approximately 1/4 the thickness of said core.
Claim 6
Dependent Claim
29 words
A panel assembly as claimed in claim 4 wherein the protective sheets have a thickness of approximately 1/4 inches and said core has a thickness of approximately 1 inch.
Claim 7
Dependent Claim
40 words
A panel assembly as claimed in claim 1 wherein a bar of material having a higher density than said core and with good screw-holding properties is located along each edge of said core between the protective sheets of fibre board.
Claim 8
Dependent Claim
16 words
A panel assembly as claimed in claim 6 wherein the material forming said bar is Masonite.
Claim 9
Dependent Claim
41 words
A panel assembly as claimed in claim 7 wherein a protective edging strip of rigid, high temperature fibre board made of bulk ceramic fibres with an alumina and silica base extends around the outside edge of each said bar of Masonite.
Claim 10
Dependent Claim
83 words
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.
Claim 11
Dependent Claim
83 words
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.
Claim 12
Dependent Claim
21 words
A door as claimed in claim 9 wherein each protective sheet is glued to the associated major face of the core.
Claim 13
Dependent Claim
17 words
A door as claimed in claim 10 wherein the protective sheets are substantially thinner than said core.
Claim 14
Dependent Claim
19 words
A door as claimed in claim 11 wherein the protective sheets have approximately 1/4 the thickness of said core.
Claim 15
Dependent Claim
28 words
A door as claimed in claim 12 wherein said protective sheets have a thickness of approximately 1/4 inches and said core has a thickness of approximately 1 inch.
Claim 16
Dependent Claim
47 words
A door as claimed in claim 9 wherein a bar of material having a higher density than the core and with good screw-holding properties is provided on each outer edge of the core between said protective sheets, and said rails and stiles are provided outside said bars.
Claim 17
Dependent Claim
15 words
A door as claimed in claim 14 wherein the material forming said bars is Masonite.
Claim 18
Dependent Claim
50 words
A door as claimed in claim 14 wherein a protective edging strip of rigid, high temperature fibre board made of bulk ceramic fibres having an alumina and silica base extends around the outside edge of each said bar of Masonite between said bar and the stile or rail provided thereon.
Claim 19
Dependent Claim
21 words
A door as claimed in claim 9 wherein the stiles and rails are made of wood treated to be fire resistant.
Claim 20
Dependent Claim
18 words
A door as claimed in claim 17 wherein the stiles and rails are treated by soaking in brine.
Claim 21
Dependent Claim
16 words
A door as claimed in claim 17 wherein the stiles and rails are made of birch.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-12-18 | 1988-06-18 | 1988-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-12-18 | 1992-06-18 | 1992-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-12-18 | 1996-06-18 | 1996-12-18 | $7700.00 | Window Closed / Lapsed |