Mark E Larson

US Patent:

20040072029, Apr 15, 2004

Filed:

Mar 20, 2003

Appl. No.:

10/393416

Inventors:

David Lowery - Roberts WI, US
Mark Larson - Maplewood MN, US
Stephen Ebner - Stillwater MN, US
Ryosuke Isobe - Superior CO, US
Guy Tadlock - Auburn AL, US

International Classification:

B05D005/12

US Classification:

428/6940BR, 427/127000

Abstract:

A method for producing a magnetic recording medium includes applying a non-magnetic back coat to a substrate, applying a magnetic front coat to the substrate, in-line calendering the coated substrate using opposed rolls, at least one of the rolls being a generally compliant roll, and off-line calendering the substrate using opposed, generally non-compliant rolls. The off-line calendering optionally includes steel-on-steel calendering and the method optionally includes only one off-line calendering pass and only one in-line calendering pass. Calendering the coated substrate optionally occurs using at least one nip, the calendering including calendering the coated substrate through a final nip including generally non-compliant rolls. Other methods, and magnetic recording media produced by such methods, also are disclosed.

US Patent:

20040253481, Dec 16, 2004

Filed:

Jun 12, 2003

Appl. No.:

10/459812

Inventors:

Mark Larson - Maplewood MN, US
Stephen Ebner - Stillwater MN, US
David Lowery - Roberts WI, US
Ryosuke Isobe - Superior CO, US

International Classification:

B32B019/00

US Classification:

428/693000, 428/6940BN

Abstract:

The magnetic recording medium includes a non-magnetic substrate having a front surface and a back surface. Coated on the front surface of the substrate is a lower support layer, or sub-layer, and at least one magnetic upper layer which together comprise the front coating. The magnetic upper layer contains a primary magnetic particulate pigment and a binder system therefor. The topmost magnetic upper layer is compressed, yielding a dense coating, with less than 14% porosity, and has a thickness of from about 0.02 micron to about 0.3 micron. The lower support layer comprises a nonmagnetic or soft magnetic pigment particle, and a binder system therefor. A back coating is formed on the back surface of the substrate. The magnetic medium of the invention has fewer than 400 tape dropouts per square inch at a 60% threshold, and fewer than 30 dropouts per square inch at a 40% threshold.

US Patent:

20060188754, Aug 24, 2006

Filed:

Apr 21, 2006

Appl. No.:

11/408743

Inventors:

David Lowery - Roberts WI, US
Mark Larson - Maplewood MN, US
Stephen Ebner - Stillwater MN, US
Ryosuke Isobe - Superior CO, US
Guy Tadlock - Auburn AL, US

International Classification:

G11B 5/716
B05D 5/12

US Classification:

428840000, 427127000

Abstract:

A method for producing a magnetic recording medium includes applying a non-magnetic back coat to a substrate, applying a magnetic front coat to the substrate, in-line calendering the coated substrate using opposed rolls, at least one of the rolls being a generally compliant roll, and off-line calendering the substrate using opposed, generally non-compliant rolls. The off-line calendering optionally includes steel-on-steel calendering and the method optionally includes only one off-line calendering pass and only one in-line calendering pass. Calendering the coated substrate optionally occurs using at least one nip, the calendering including calendering the coated substrate through a final nip including generally non-compliant rolls. Other methods, and magnetic recording media produced by such methods, also are disclosed.

US Patent:

56288271, May 13, 1997

Filed:

Aug 20, 1993

Appl. No.:

8/109352

Inventors:

Robert P. McCollam - Roseville MN
Norman E. Gehrke - Browton MN
Karl J. Warren - Hudson WI
Mark D. Larson - Maplewood MN
George D. Kostuch - White Bear Lake MN
Thomas W. Braid - White Bear Lake MN

Assignee:

Minnesota Mining and Manufacturing Company - St. Paul MN

International Classification:

B05C 1100

US Classification:

118695

Abstract:

A coater incorporates a die, a reservoir, a gravure cylinder, and a doctor blade for applying coating fluid to a moving surface. The flow rate of coating fluid to the gravure cylinder is controlled to equal the rate at which coating fluid is consumed by the coating process. This eliminates the need to recycle surplus coating fluid. The coating fluid can be quickly and conveniently replaced with a solvent in the reservoir when coating is not being performed to reduce the occurrence of coating defects arising from excessive evaporation of solvent and premature solidification of coating fluid.

US Patent:

58234551, Oct 20, 1998

Filed:

Dec 20, 1996

Appl. No.:

8/771177

Inventors:

Mary R. Hable - Stillwater MN
Mark R. Larson - Oakdale MN
Kam W. Law - Woodbury MN

Assignee:

Imation Corp. - Oakdale MN

International Classification:

G11B 23087
G11B 2304
G11B 1532

US Classification:

242340

Abstract:

Using corner roller assemblies with different drag force profiles provides improved control in establishing tape tension characteristics of a belt-driven tape cartridge. The belt driven tape cartridge has a tape tension profile and is of the type comprising first and second corner roller assemblies defining a portion of a drive belt path of a cartridge. The first corner roller assembly has a first drag force profile and includes a first shaft and a first rotating member comprising a first bore. The first rotating member is rotatably mounted on the first shaft, such that the first shaft is disposed in the first bore. The second corner roller assembly has a second drag force profile and includes a second shaft and a second rotating member comprising a second bore. The second rotating member is rotatably mounted on the second shaft, such that the second shaft is disposed in the second bore. The first and second corner roller assemblies are configured such that the drag force profile of the first corner roller assembly is preselected to be different from the drag force profile of the second corner roller assembly in order to totally establish the tape tension of the cartridge.