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US 6,306,488 B1Granted
Composite rigid sponge structure
OwnerNorman B. Rainerinventor
Life of this patent
Estimating the term…
Abstract
A composite porous structure includes a macroporous open-pore sponge of regenerated cellulose having disposed within the pores a microporous polyvinyl chloride (PVC) substrate. The total empty space of the structure, produced by the pores, is between 60% and 92% of the outer envelope geometrical volume of the structure. The wet compressive strength of the structure is at least ten times greater than the wet compressive strength of the cellulose sponge without the PVC.
Claims10
A composite porous structure comprising:
- a) an open-pore sponge comprised of regenerated cellulose, and
- b) microporous polyvinyl chloride (PVC) deposited within said pores, the weight ratio of said PVC to said regenerated cellulose being between 5/1 and 1/1,
- c) the total volume of said pores being between 60% and 92% of the geometric volume of said structure, and
- d) the wet compressive strength of said structure being at least ten times greater than the wet compressive strength of said open-pore cellulose sponge without said PVC.
1 more element
A composite porous structure comprising:
- a) a macroporous open-celled sponge comprised of regenerated cellulose, and
- b) microporous polyvinylchloride (PVC) deposited within said macropores, the weight ratio of said PVC to said cellulose being between 5/1 and 1/1,
- c) the total empty space volume produced by the pores of said structure being between 80% and 92% of the outer geometrical volume of said structure, and
- d) the wet compressive strength of said structure is at least ten times greater than the wet compressive strength of said macroporous cellulose sponge without said PVC.
1 more element
Dependencies are inferred from the claim text.