US 6,358,575 B1 · Method of making an article from a lightweight cementitious composition and a decorative article made therefrom

Abstract

A method of making an article from a lightweight cementitious composition includes molding a castable cementitious mixture including an aqueous slurry of at least perlite and concrete into an article, such as a hollow, decorative article. The castable cementitious mixture can include a fibrous material, for reinforcing the cement and perlite, and an air entraining agent, for facilitating mixability and reducing a density of the cementitious mixture and facilitating casting. The mold can include an external mold form that contains the cementitious mixture and an internal mold form that displaces the cementitious mixture within the external mold form to cast the hollow article in various shapes and with various surface textures. The external and internal mold forms include liners made of a lightweight flexible material that can be removed, unfolded, and prepared and/or cleaned.

Claims19

Dependent claims

A molded, decorative article comprising:

a body portion made of a cementitious composition including at least cement, perlite, and a fibrous material, wherein said perlite includes at least expanded perlite aggregate, said body portion including a plurality of walls defining a hollow internal region, at least one of said plurality of walls including a green finished outer surface having a decorative texture, wherein at least some of said fibrous material is exposed at said outer surface, and wherein said fibrous material exposed at said outer surface is melted.

Dependencies are inferred from the claim text.

Facts

Application

09/235,987Filed 22 Jan 1999 · division

Priority

13 Jun 1997

Granted

19 Mar 2002

Term ends

Not estimatedThe source records don’t support an estimate.

Classification17 codes

B28B 1/44
Producing shaped prefabricated articles from the material: by forcing cores into filled moulds for forming hollow articles
B28B 7/0064
Moulds; Cores; Mandrels: moulds characterised by special surfaces for producing a desired surface of a moulded article, e.g. profiled or polished…
B28B 7/362
Linings or coatings, e.g. removable, absorbent linings, permanent anti-stick coatings; Linings becoming a non-permanent layer of the moulded…
B28B 7/384
Treating surfaces of moulds, cores, or mandrels to prevent sticking: treating agents

Method of making an article from a lightweight cementitious composition and a decorative article made therefrom

Life of this patent

Method of making an article from a lightweight cementitious composition and a decorative article made therefrom

Life of this patent

Abstract

Claims19