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US 4,397,900 AGranted
Magnetic carpet tile
AssigneeMilliken Research Corporation
InventorKenneth B. Higgins
Life of this patent
Estimating the term…
Abstract
A method of producing a carpet tile with a backing material that is magnetically attracted to a metal surface to hold the tile in position. The method produces a carpet tile in which the magnetic backing material is flush with the secondary backing to produce a tile of substantially constant thickness.
Claims4
The method of making a carpet adapted to adhere to a metallic surface comprising the steps of:
- providing a supply of primary carpet material with an upstanding fiber surface, providing a secondary backing material, coating the secondary backing material with a polyvinyl chloride plastisol while simultaneously supplying a narrow strip of magnetic material into contact with the polyvinyl chloride plastisol, applying pressure to the secondary backing material, the polyvinyl chloride plastisol and the strip of magnetic material to embed the magnetic material into the polyvinyl chloride plastisol to form a secondary carpet backing, laminating the secondary carpet backing to the back of the primary carpet material, and applying heat to the laminated primary carpet material and secondary carpet backing to set the polyvinyl chloride plastisol.
Dependencies are inferred from the claim text.