Kenneth P Kreska

US Patent:

20120076708, Mar 29, 2012

Filed:

Sep 19, 2011

Appl. No.:

13/236107

Inventors:

Joseph E. Ferri - Shillington PA, US
Kenneth P. Kreska - Shillington PA, US

Assignee:

GENERAL POLYMERIC CORPORATION - Reading PA

International Classification:

B01L 3/02
C08L 1/10
B01D 29/00
C08L 23/06
C08B 11/08
C08L 1/04
C08J 9/28

US Classification:

422513, 25218212, 521 64, 536 95, 210490

Abstract:

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.

US Patent:

20090220386, Sep 3, 2009

Filed:

Mar 2, 2009

Appl. No.:

12/395927

Inventors:

Joseph E. Ferri - Shillington PA, US
Kenneth P. Kreska - Shillington PA, US

International Classification:

B01L 3/02
C08B 15/00
C08L 1/02
B32B 27/06

US Classification:

422100, 536 56, 525 5423, 428509, 536124

Abstract:

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.