David J Paulson
Electrician at Van Buren Way, Hopkins, MN

License number
Colorado 25055
Issued Date
May 17, 1997
Renew Date
Mar 1, 2003
Expiration Date
Feb 28, 2005
Type
Master Electrician
Address
Address
729 N Van Buren Way N. Van Buren Way, Hopkins, MN 55343
LicenseFiles verified this license of Dec 9, 2016 at the Colorado - Department of Regulatory Agencies.

Professional information

David Paulson Photo 1

Tapered, Spirally Wound Filter Cartridge And Method Of Making Same

US Patent:
4839037, Jun 13, 1989
Filed:
Apr 6, 1987
Appl. No.:
7/037113
Inventors:
Robert A. Bertelsen - St. Louis Park MN
David J. Paulson - Minnetonka MN
Assignee:
Osmonics, Inc. - Minnetonka MN
International Classification:
B01D 2704, B01D 2906
US Classification:
210 97
Abstract:
A spirally wound filter cartridge and a method of making the same in which the cartridge includes an elongated, centrally disposed tube or mandrel, and a sheet of filtration material spirally wound around the tube such that the cartridge has a tapered configuration with a first end of the cartridge being greater in diameter than the second end. The present invention also relates to a filtration device having a filter cartridge housing adapted to receive the above mentioned tapered filter cartridge.

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