Back to results
US 2012/0076708 A1Published application
Porous sealing material
AssigneeGeneral Polymeric Corporation
InventorsJoseph E. Ferri, Kenneth P. Kreska
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeGeneral Polymeric Corporation
InventorsJoseph E. Ferri, Kenneth P. Kreska
Estimating the term…
A porous article of manufacture (a sealing material) which comprises sintered hydroxyalkylcellulose, for example, sintered hydroxypropylcellulose, or a sealing material which is capable of being formed into a porous article in the form of a filter and which is made by heating at least one gelling agent that has carboxyl functionality and at least one gelling agent that has hydroxyl functionality, preferably carboxylmethylcellulose (CMC) and hydroxypropylcellulose (HPC) respectively, and a method for preparing the same from a powdery admixture thereof, and a pipette which includes the sealing material in the form of a filter, and also including embodiments of a bilayer filter and of a trilayer filter, each of which comprises a composite of a filter of the present invention and a filter comprising porous sintered polyethylene, preferably ultra high-molecular weight polyethylene.
A solid porous sealing material which is capable of being formed into a filter and which comprises sintered hydroxyalkylcellulose.
A solid porous sealing material which is capable of being formed into a porous article in the form of a filter and which is made by heating at least one gelling agent which has carboxyl functionality and at least one gelling agent which has hydroxyl functionality.
A method for preparing a porous sealing material comprising heating hydroxyalkylcellulose in powdery form under conditions which convert the particles of the powder to a porous solid mass.
A method for preparing a porous sealing material comprising heating an aqueous solution of a gelling agent which has carboxyl functionality and a gelling agent which has hydroxyl functionality under conditions which form a product which in powdery form is a sinterable material and recovering the product from the aqueous solution after evaporating the water of the solution.
Dependencies are inferred from the claim text.