Rafael B Gutierrez

Address:

8010 Elwood St, Houston, TX 77012

VIN:

1GNFC13087R196947

Make:

CHEVROLET

Model:

TAHOE

Year:

2007

US Patent:

20100201338, Aug 12, 2010

Filed:

Feb 5, 2010

Appl. No.:

12/701235

Inventors:

Mohamed Y. Haj-Maharsi - Houston TX, US
Le Tang - Cary NC, US
Rafael Gutierrez - Wytheville VA, US
Sandeep Bala - Raleigh NC, US

Assignee:

ABB RESEARCH LTD. - Zurich

International Classification:

G05F 3/04

US Classification:

323305, 336192

Abstract:

A hybrid transformer is provided that includes an electromagnetic transformer and an AC-AC converter with a DC bridge. The AC-AC converter is operable to keep the input voltage and current of the hybrid transformer substantially in phase and to reduce fluctuation in the output voltage of the hybrid transformer in the event of an increase or decrease in the input voltage.

US Patent:

58632379, Jan 26, 1999

Filed:

Dec 4, 1996

Appl. No.:

8/760388

Inventors:

Wayne L. Felts - Oklahoma City OK
Christopher A. Kastl - Yukon OK
Rafael Eduardo Gutierrez - Edmond OK

Assignee:

Seagate Technology, Inc. - Scotts Valley CA

International Classification:

B24B 3906
G11B 1546

US Classification:

451 41

Abstract:

A method of and apparatus for burnishing a surface of a magnetic disc of a disc drive are disclosed. The disc drive has a data head and an actuator supporting the head as the head flies above the surface of the disc. A controller causes the disc to be rotated at rates of rotation which will result in burnishing head fly heights which are less than a normal operational fly height of the head. An actuator controller controls the actuator to repeatedly move the head across a region of the disc during a burnishing time period. The head flies above the surface of the disc at the burnishing fly heights during the burnishing time period to thereby reduce asperities on the disc.