VIJAY K BASRA
Broker in Reading, MA

6500351, Dec 31, 2002

May 24, 1999

09/317484

Andrew L. Wu - Shrewsbury MA
Jeffrey G. Greiman - Worcester MA
Lawrence G. Neumann - Lancaster MA
Vijay K. Basra - Reading MA

Maxtor Corporation - Longmont CO

C23F 1700

216 22, 216 75, 216100, 134 37, 438695, 438704, 438712, 427128, 427130, 427264, 427270, 427272

A recording head pole production process, and a pole made by the process, in which a combination of wet and dry etching steps are utilized to advantageously provide an undercut in the relatively high magnetic moment material beneath a photoresist area used to define the pole such that any re-deposited layer of material which occurs on the sides of the pole and photoresist area during the dry etching operation is advantageously rendered substantially discontinuous, or weakly linked, and the re-deposited material remaining on the pole itself following a photoresist strip can then be removed by being subjected to a stream of gaseous particles and ultimately carried away by the accompanying gas stream itself. In a particular embodiment disclosed herein the relatively high magnetic moment material may comprise a sputter deposited layer of cobalt-zirconium-tantalum (CoZrTa), iron-aluminum-nitride (FeAlN), iron-tantalum-nitride (FeTaN), iron-nitride (FeN) or similar materials. The stream of gaseous particles may be formed utilizing the expansion of a gaseous material, such as liquid carbon dioxide (CO ), through a nozzle directed at the re-deposited material remaining on the pole following the photoresist strip operation.

6524689, Feb 25, 2003

Oct 28, 1999

09/429379

Vijay K. Basra - Reading MA
Lawrence G. Neumann - Lancaster MA

Quantum Corporation - Milpitas CA

C03F 700

428220, 428332, 428336, 430496

A castellation technique for improved lift-off of deposited thin film on photoresist in thin-film device processing of particular utility in the production of magnetic data transducers and recording heads. By correctly designing the edge boundary of a photoresist structure, enhanced regions of low resist edge bombardment and low deposit penetration may be achieved. These enhanced regions enable the lift-off of extra thick deposited regions that would not be otherwise achievable through the use of conventional techniques with and without castellation.

6716515, Apr 6, 2004

Jan 16, 2003

10/346326

Vijay K. Basra - Reading MA
Lawrence G. Neumann - Lancaster MA

Quantum Corporation - San Jose CA

C03F 700

4281951, 428220, 428332, 430313, 430314, 430323, 430324, 430496

A castellation technique for improved lift-off of deposited thin film on photoresist in thin-film device processing of particular utility in the production of magnetic data transducers and recording heads. By correctly designing the edge boundary of a photoresist structure, enhanced regions of low resist edge bombardment and low deposit penetration may be achieved. These enhanced regions enable the lift-off of extra thick deposited regions that would not be otherwise achievable through the use of conventional techniques with and without castellation.

6685845, Feb 3, 2004

Dec 31, 2002

10/335685

Andrew L. Wu - Shrewsbury MA
Jeffrey G. Greiman - Worcester MA
Lawrence G. Neumann - Lancaster MA
Vijay K. Basra - Reading MA

Maxtor Corporation - Longmont CO

B44C 122

216 22

A recording head pole production process, and a pole made by the process, in which a combination of wet and dry etching steps are utilized to advantageously provide an undercut in the relatively high magnetic moment material beneath a photoresist area used to define the pole such that any re-deposited layer of material which occurs on the sides of the pole and photoresist area during the dry etching operation is advantageously rendered substantially discontinuous, or weakly linked, and the re-deposited material remaining on the pole itself following a photoresist strip can then be removed by being subjected to a stream of gaseous particles and ultimately carried away by the accompanying gas stream itself. In a particular embodiment disclosed herein the relatively high magnetic moment material may comprise a sputter deposited layer of cobalt-zirconium-tantalum (CoZrTa), iron-aluminum-nitride (FeAlN), iron-tantalum-nitride (FeTaN), iron-nitride (FeN) or similar materials. The stream of gaseous particles may be formed utilizing the expansion of a gaseous material, such as liquid carbon dioxide (CO ), through a nozzle directed at the re-deposited material remaining on the pole following the photoresist strip operation.

6375063, Apr 23, 2002

Jul 16, 1999

09/354825

Vijay K. Basra - Reading MA
Lawrence G. Neumann - Lancaster MA

Quantum Corporation - Milpitas CA

G11B 5127

228215, 430312, 2960301, 360110

A multi-step stud design and method for fabricating the same of special utility for producing closely packed interconnects in magnetic recording heads, particularly higher density magnetoresistive and giant magnetoresistive tape heads. The multi-step stud fabrication process and structure enables the achievement of significantly higher interconnect densities resulting in an increased number of channels per millimeter on a single computer mass storage device recording head. A resultant stronger encapsulation surrounding the stud further provides increased channel reliability. The improved uniformity of the photoresist aperture achieved for each step in the stud structure, and lower current spreading resistance because of the wider underlying stud base size, increases stud uniformity resulting in improved stud yields. This increased yield compared with conventional single step stud processes reduces cost, even with the additional photolithography and plating processes involved.

7023650, Apr 4, 2006

Nov 7, 2001

10/037083

Vijay K. Basra - Reading MA, US
Leo Guglielmo - Ormond Beach FL, US
George Bellesis - Jefferson MA, US

Quantum Corporation - San Jose CA

G11B 5/584

360 7712, 360122

A technique of positioning a recording head relative to an optical servo system in a magnetic recording tape system read/write assembly is described. The technique includes positioning an optical sensor of the optical servo system at a first position relative to a selected one of recording channels on the recording head and positioning the optical sensor at a second position relative to the selected recording channel using an alignment target on the recording head. A recording head in a read/write assembly of a magnetic recording tape system is also described. The recording head includes recording channels fabricated on a wafer and an alignment target affixed to the wafer between a first read-write element of a recording channel and a second read-write element of the recording channel, the alignment target fabricated to produce an optical reflectance signal.

2006015, Jul 13, 2006

Mar 6, 2006

11/369427

Vijay Basra - Reading MA, US
Lawrence Neumann - Lancaster MA, US
Zhenghao Liu - Framingham MA, US

Quantum Corporation - Milpitas CA

G11B 5/187

029603010, 029603070, 029603110, 029605000, 360122000

A magnetic head for use with a magnetic recording medium includes a top write pole for use in recording information on the magnetic recording medium, and a solenoidal coil structure having a lower coil layer disposed below the top write pole and an upper coil layer disposed above the top write pole. The upper coil layer and the lower coil layer are insulated from the top write pole. The magnetic head also includes a vertical interconnect structure connecting the lower coil layer to the upper coil layer.

2004008, May 6, 2004

Nov 5, 2002

10/289120

Vijay Basra - Reading MA, US
Lawrence Neumann - Lancaster MA, US
Zhenghao Liu - Framingham MA, US

G11B005/39, G11B005/127

360/317000, 360/126000, 360/123000, 029/603180

A magnetic head for use with a magnetic recording medium includes a top write pole for use in recording information on the magnetic recording medium, and a solenoidal coil structure having a lower coil layer disposed below the top write pole and an upper coil layer disposed above the top write pole. The upper coil layer and the lower coil layer are insulated from the top write pole. The magnetic head also includes a vertical interconnect structure connecting the lower coil layer to the upper coil layer