Michael James Perreault

US Patent:

6615893, Sep 9, 2003

Filed:

Mar 19, 2001

Appl. No.:

09/812265

Inventors:

Timothy R. Hedlund - Shoreview MN
Wilmer E. Blietz - New Richmond WI
Kevin D. Strand - Stillwater MN
James R. Sim - White Bear Lake MN
Gregory V. Spaulding - Golden Valley MN
Theodore W. Jagger - White Bear Lake MN
Michael S. Perreault - Hugo MN

Assignee:

Midmac Systems - St. Paul MN

International Classification:

B29C 5338

US Classification:

156443, 156474

Abstract:

A filter forming and joining apparatus of the present invention automatically forms a succession of metal-free cylindrical filter elements from a pleat block of pleated filter material, each pleat block having a first end pleat at a first end of the pleat block and a second end pleat at a second end of the pleat block. The apparatus including a pleat block isolator for isolating successive individual pleat blocks from other pleat blocks in a succession of pleat blocks in preparation for filter formation, a filter former that manipulates each isolated pleat block along a forming path into a hollow cylinder shape, the hollow cylinder-shaped isolated pleat block having a first end pleat and a second end pleat positioned adjacent each other, and a filter joiner that bonds together the adjacent first and second end pleats of each hollow cylinder-shaped isolated pleat block producing a metal-free cylindrical filter element.

US Patent:

6616785, Sep 9, 2003

Filed:

Mar 19, 2001

Appl. No.:

09/812155

Inventors:

Timothy R. Hedlund - Shoreview MN
Wilmer E. Blietz - New Richmond WI
Kevin D. Strand - Stillwater MN
James R. Sim - White Bear Lake MN
Gregory V. Spaulding - Golden Valley MN
Theodore W. Jagger - White Bear Lake MN
Michael S. Perreault - Hugo MN

Assignee:

Midmac Systems, Inc. - St. Paul MN

International Classification:

B29C 5338

US Classification:

156218, 156474

Abstract:

A filter forming and joining method of the present invention automatically forms a succession of metal-free cylindrical filter elements from a pleat block of pleated filter material, each pleat block having a first end pleat at a first end of the pleat block and a second end pleat at a second end of the pleat block. The method includes using a pleat block isolator for isolating successive individual pleat blocks from other pleat blocks in a succession of pleat blocks in preparation for filter formation, a filter former for manipulating each isolated pleat block along a forming path into a hollow cylinder shape, the hollow cylinder-shaped isolated pleat block having a first end pleat and a second end pleat positioned adjacent each other, and a filter joiner for bonding together the adjacent first and second end pleats of each hollow cylinder-shaped isolated pleat block producing a metal-free cylindrical filter element.

US Patent:

62307770, May 15, 2001

Filed:

Feb 4, 1999

Appl. No.:

9/244472

Inventors:

Timothy R. Hedlund - Shoreview MN
Wilmer E. Blietz - New Richmond WI
Kevin D. Strand - Stillwater MN
James R. Sim - White Bear Lake MN
Gregory V. Spaulding - Golden Valley MN
Theodore W. Jagger - White Bear Lake MN
Michael S. Perreault - Hugo MN

Assignee:

Midmac Systems, Inc. - St. Paul MN

International Classification:

B31F 700

US Classification:

156443

Abstract:

A filter forming and joining apparatus of the present invention automatically forms a succession of metal-free cylindrical filter elements from a pleat block of pleated filter material, each pleat block having a first end pleat at a first end of the pleat block and a second end pleat at a second end of the pleat block. The apparatus including a pleat block isolator for isolating successive individual pleat blocks from other pleat blocks in a succession of pleat blocks in preparation for filter formation, a filter former that manipulates each isolated pleat block along a forming path into a hollow cylinder shape, the hollow cylinder-shaped isolated pleat block having a first end pleat and a second end pleat positioned adjacent each other, and a filter joiner that bonds together the adjacent first and second end pleats of each hollow cylinder-shaped isolated pleat block producing a metal-free cylindrical filter element.