Composite slab incorporating a sheet of marble or similar natural stone, for the formation of facings for building, interior decoration and the like

• US 4,640,850 A
• Filed: 12/06/1984
• Issued: 02/03/1987
• Est. Priority Date: 04/18/1983
• Status: Expired due to Fees

• Current Assignee: Seifag SRL, Technomarmi Maiera SPA
• Original Assignee: Seifag SRL, Technomarmi Maiera SPA
• Inventors: Marocco, Giuseppe
• Primary Examiner(s): Lesmes, George F.
• Assistant Examiner(s): Schwartz, P. R.
• Application Number:
  US06/679,089
• Time in Patent Office: 789 Days
• Field of Search: 428/15, 428/172, 428/173, 428/437, 428/49, 428/542.2, 428/542.4, 428/542.6, 428/426, 52/612
• US Class Current: 428/15
• CPC Class Codes: B32B 17/06 comprising glass as the main or only constituent of a layer, next to another layer of a specific material
• CPC Class Codes: B32B 37/04 characterised by the partial melting of at least one layer
• CPC Class Codes: B32B 9/04 comprising such particular substance as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a glass layer B32B17/06; layered products with at least two ceramic layers composed mainly of ceramic B32B18/00
• CPC Class Codes: B44C 3/02 Superimposing layers B44C3/005 takes precedence
• CPC Class Codes: B44C 5/06 Natural ornaments; Imitations thereof artificial flowers, fruit, leaves A41G1/00; artificial feathers A41G11/00
• CPC Class Codes: B44F 1/06 produced by transmitted light, e.g. transparencies, imitations of glass paintings
• CPC Class Codes: E04C 2/30 characterised by the shape or structure translucent E04C2/54
• CPC Class Codes: Y10T 428/166 Glass, ceramic, or metal sections [e.g., floor or wall tile, etc.]
• CPC Class Codes: Y10T 428/24612 Composite web or sheet
• CPC Class Codes: Y10T 428/2462 with partial filling of valleys on outer surface
• CPC Class Codes: Y10T 428/3163 Next to acetal of polymerized unsaturated alcohol [e.g., formal butyral, etc.]

Abstract

A composite facing slab comprises a sheet of natural stone, such as marble, and a protective layer constituted by a sheet of transparent glass. The latter is fixed to the face of the stone sheet intended to remain visible with the interpositioning of an interlayer of transparent thermoplastics material which can adhere to both the sheets and fills the surface defects (pores, cavities, cracks and the like) of the stone sheet.

Claims

1. A composite slab for exterior facings on a building, interior decoration and the like comprising a thin sheet of natural stone having at least one rough unfinished face intended to be visible in use, a protective sheet of transparent glass overlying said rough unfinished face and a layer of transparent thermoplastics material interposed between said sheets and adhered to both sheets for connecting said sheets to define a composite slab wherein the thermoplastics material completely fills any surface defects in the rough unfinished face of said stone sheet so as to provide a smooth finished appearance to said surface of said stone sheet when viewed through said glass sheet and said layer of thermoplastics material while providing protection for said stone sheet against corrosion.

2. A composite slab as defined in claim 1 wherein said stone sheet has a thickness of less than 10 mm and further comprising a reinforcing layer of high tensile strength secured to the face of said stone sheet opposite said visible face.

3. A composite slab as defined in claim 2 wherein said reinforcing layer is comprised of a synthetic resin material reinforced with glass fibres.