The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 02, 2007
Filed:
Oct. 05, 2001
Allyn R. Marsh, Eden Prairie, MN (US);
Russ Schaffenberg, Bloomington, MN (US);
Steven D. Jons, Eden Prairie, MN (US);
Roy A. Davis, Midland, MI (US);
Allyn R. Marsh, Eden Prairie, MN (US);
Russ Schaffenberg, Bloomington, MN (US);
Steven D. Jons, Eden Prairie, MN (US);
Roy A. Davis, Midland, MI (US);
Dow Global Technologies Inc., Midland, MI (US);
Filmtec Corporation, Minneapolis, MN (US);
Abstract
A package assembly comprising a sealed water-impermeable bag enclosing: a spiral wound filtration element comprising a piperazine-based membrane, and an aqueous solution comprises a substantially non-oxidizable buffer having capacity to sequester at least 0.0025 moles per liter of hydrogen ions. The assembly preferably further includes a reducing agent. The assembly provides improved preservation for piperazine-based membranes and elements incorporating such membranes.