Patent US3579012A successfully refreshed from Google Patents.
US4455801A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Light weight vault wall
Assignee: HER MAJESTY IN RIGHT OF CANADA AS REPRESENTED BY SOLICITOR GENERAL OF CANADA
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Filing: 1982-07-29
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Granted: 1984-06-26
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Expires: 2002-07-29
Abstract
Abstract A light weight composite panel for use in vaults or strong rooms, having a foamed plastic core, metal mesh embedded in the major faces of the core, a layer of wood on each face of the plastic core, and a sheet metal skin covering the layers of wood. An inner one of the sheet metal skins is preferably a heat conductive metal, such as aluminum.
Inventors
- 👤 W. R. Merritt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:39
CPC Classifications
E; E04; E04H; E04H9/00; E04H9/04; E04H9/10; E04H1/00; E04H1/12; E04H1/125; E04H1/1261
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
93 words
A strong wall for delaying unauthorized access to the interior of a vault or other structure constructed of said strong walls, said strong walls comprising: a foamed polymeric resin core capable of bonding with power tools and producing noxious fumes when burned, said core having inner and outer major faces, expanded metal mesh embedded in at least an outer face of said core, inner and outer wood panels covering both faces of said core, a heat conductive metal sheet covering the inner wood panel, and a metal sheet covering said outer wood panel.
Claim 2
Dependent Claim
93 words
A strong wall for delaying unauthorized access to the interior of a vault or other structure constructed of said strong walls, said strong walls comprising: a foamed polymeric resin core capable of bonding with power tools and producing noxious fumes when burned, said core having inner and outer major faces, expanded metal mesh embedded in at least an outer face of said core, inner and outer wood panels covering both faces of said core, a heat conductive metal sheet covering the inner wood panel, and a metal sheet covering said outer wood panel.
Claim 3
Dependent Claim
16 words
A strong wall structure as claimed in claim 1 wherein said foamed polymeric resin is polyurethane.
Claim 4
Dependent Claim
15 words
A strong wall structure as claimed in claim 1 wherein said wood panels comprise plywood.
Claim 5
Dependent Claim
16 words
A strong wall structure as claimed in claim 1 wherein said heat conductive material is aluminum.
Claim 6
Dependent Claim
19 words
A strong wall as claimed in claim 1 wherein said metal sheet on said wood panel is stainless steel.
Claim 7
Dependent Claim
56 words
A strong wall structure as claimed in claim 1 wherein joints between panels are covered by metal strips bolted to adjoining panels by bolts having their heads welded to the inner faces of the strips and their other ends secured to metal strips on the inner face of the wall so as to cover said joint.
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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) | 1987-06-26 | 1987-12-26 | 1988-06-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-06-26 | 1991-12-26 | 1992-06-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-06-26 | 1995-12-26 | 1996-06-26 | $7700.00 | Window Closed / Lapsed |