US 20020155034A1
(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2002/0155034 Al
Perman et al. (43) Pub. Date: Oct. 24,2002
(54) WELL-LESS FILTRATION DEVICE
(75) Inventors: Craig A. Perman, Woodbury, MN
(US); Jason R. Jacobson, Columbia,
MO (US)
Correspondence Address:
Attention: Christopher D. Gram
Office of Intellectual Property Counsel
3M Innovative Properties Company
P.O. Box 33427
St. Paul, MN 55133-3427 (US)
(73) Assignee: 3M Innovative Properties Company
(21) Appl. No.: 10/167,370
(22) Filed: Jun. 11, 2002
Related U.S. Application Data
(63) Continuation ol application No. PCT/US00/12468, filed on May 8, 2000.
(30) Foreign Application Priority Data
Dec. 23, 1999 (EP) 99204504.7
Publication Classification
(51) Int. CI.7 BOIL 11/00
(52) U.S. CI 422/101; 422/99; 422/102;
422/942; 422/948; 436/177; 436/178; 435/287.7; 435/287.8; 435/288.3; 435/288.4; 435/288.5
(57) ABSTRACT
The present invention provides a well-less filtration device that includes a pre-filter layer; a support layer; and at least one layer of solid phase extraction medium disposed between the pre-filter layer and the support layer. At least a portion of the pre-filter layer, support layer and solid phase extraction medium are ultrasonically welded together to form a pattern of filter cells and land areas with the land areas being disposed between the filter cells. The filter cells of the device may be arranged to conform to a standardized array format.
