Rebecca Maria Martin

US Patent:

20040191573, Sep 30, 2004

Filed:

Mar 31, 2003

Appl. No.:

10/403656

Inventors:

Richard Fuller - Lake Elmo MN, US
Ruth Erkkila - Lilydale MN, US
Gary Featherstone - Maplewood MN, US
Rebecca Martin - Woodbury MN, US

International Classification:

G11B005/66

US Classification:

428/6940BH, 428/69400R

Abstract:

A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains magnetic metallic pigment particles having a coercivity of at least about 2500 Oersteds (Oe) and a binder system for the pigment. The magnetic recording medium has fewer than 120 tape dropouts per square inch at a 60% threshold, and fewer than 20 dropouts per square inch at a 40% threshold.

US Patent:

20040191574, Sep 30, 2004

Filed:

Mar 31, 2003

Appl. No.:

10/403753

Inventors:

Richard Fuller - Lake Elmo MN, US
Ruth Erkkila - Lilydale MN, US
Gary Featherstone - Maplewood MN, US
Rebecca Martin - Woodbury MN, US

International Classification:

G11B005/66

US Classification:

428/6940BS, 428/69400R

Abstract:

A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer, wherein the magnetic layer contains magnetic metallic pigment particles having a coercivity of at least about 2500 Oersteds (Oe), and a binder system for the pigment. The magnetic recording medium exhibits significantly improved broadband signal-to-noise, and skirt signal-to-noise ratios, as well as an improved high frequency carrier-to noise ratio.

US Patent:

20040253482, Dec 16, 2004

Filed:

Jun 12, 2003

Appl. No.:

10/460283

Inventors:

James Philip - Mahtomedi MN, US
Gary Featherstone - Maplewood MN, US
Rebecca Martin - Woodbury MN, US
Andrei Potanin - Woodbury MN, US
Stanley Busman - North St. Paul MN, US
Meng Hsieh - Woodbury MN, US

International Classification:

B32B019/00

US Classification:

428/693000, 428/6940BU, 428/69400B

Abstract:

A dual-layer magnetic recording medium including a non-magnetic substrate having a front side and a back side, a lower support layer formed over the front side and a magnetic upper recording layer formed over the lower layer comprising at least one magnetic particle pigment formed over said lower support layer, at least one of said layers of the front coating comprising a polymer binder system for the pigment, such binder system comprising a hard resin component and a soft resin component, wherein the soft resin component comprises a polyurethane polymer, and the hard resin component comprises a nonhalogenated vinyl copolymer comprising a plurality of pendent nitrile groups, a plurality of pendent hydroxyl groups, and at least one pendent dispersing group.