Theodore A Schwarz, 846559 Grove Park Dr, Hoschton, GA 30548
Theodore Schwarz Phones & Addresses
6559 Grove Park Dr, Hoschton, GA 30548 651-7392612
Pearland, TX
Alpharetta, GA
Woodbury, MN
Rochester, MN
Acton, MA
Orange Beach, AL
Mentions for Theodore A Schwarz
Publications & IP owners
Us Patents
Apparatuses And Methods For Pre-Erasing During Manufacture Of Magnetic Tape
US Patent:
7283317, Oct 16, 2007
Filed:
Jan 30, 2004
Appl. No.:
10/768719
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
Assignee:
Advanced Research Corporation - White Bear MN
International Classification:
G11B 5/09
G11B 15/18
G11B 15/18
US Classification:
360 48, 360 71
Abstract:
The present invention relates to direct current (“DC”) pre-erasing servo channels of a magnetic tape prior to writing servo data in a servo channel. The present invention particularly relates to those servo recordings which were written with a uni-polar current waveform. The DC pre-erase is performed using a uni-polar direct current of a polarity that is opposite to the polarity of the direct current used to write the servo data. This pre-erase may be done with one or more heads. Also, as will be described, the pre-erase of a servo channel and writing to a servo channel may be done by making two passes over a single head or by using two or more heads to perform both steps. Also, it is within the scope of the present invention to have the heads mounted on a single mount or have the heads on separate mounts and on separate tape decks.
Stepped Time Based Servo Pattern And Head
US Patent:
7301716, Nov 27, 2007
Filed:
Mar 2, 2004
Appl. No.:
10/791675
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
Assignee:
Advanced Research Corporation - White Bear MN
International Classification:
G11B 5/09
G11B 21/02
G11B 21/02
US Classification:
360 48, 360 7712, 360 75
Abstract:
The present invention relates to a method of synthesizing the slanted transitions in a time based servo pattern using servo write gaps that are perpendicular to the tape motion. The present invention particularly relates to a method of writing a servo pattern on magnetic tape so as to minimize errors in the servo pattern. The slanted transitions in a time-based servo pattern are synthesized using servo write gaps that are perpendicular to the tape motion. The slanted portions of the write gaps are synthesized by a series of short segmented vertical and horizontal segments. In so minimizing errors, distortion in the reading and/or writing of the data tracks can be prevented.
Intergrated Thin Film Subgap Subpole Structure For Arbitrary Gap Pattern Magnetic Recording Heads And Method Of Making The Same
US Patent:
7450341, Nov 11, 2008
Filed:
May 3, 2005
Appl. No.:
11/120640
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
Assignee:
Advanced Research Corporation - White Bear MN
International Classification:
G11B 21/02
G11B 5/584
G11B 5/584
US Classification:
360121, 360 7712
Abstract:
An arbitrary gap thin film magnetic recording head is fabricated by forming a substrate based on traditional vertical planar thin film head wafer technology which is designed to produce an integrated subgap and subpole substrate structure. The recording head includes a pair of magnetically permeable thin film subpoles, separated by a low permeability subgap structure. An electrically conductive coil may be embedded, in part, within the subgap structure. Thus, the subpoles and subgap structure form part of a magnetic circuit. A highly permeable magnetic surface film spans from one subpole to the other having one or more arbitrary gap patterns. That is, a surface thin film is deposited and patterned on the tape bearing surface of the head to optimize various element configurations, gap patterns and head-to-tape medium contact.
Stepped Time Based Servo Pattern And Head
US Patent:
7511907, Mar 31, 2009
Filed:
Feb 17, 2005
Appl. No.:
11/060627
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
Assignee:
Advanced Research Corporation - White Bear MN
International Classification:
G11B 5/09
G11B 21/02
G11B 5/584
G11B 21/02
G11B 5/584
US Classification:
360 48, 360 75, 360 7712, 360121
Abstract:
The present invention relates to apparatuses and methods used in manufacturing magnetic tape. More specifically, the present invention relates to a method of writing a servo pattern on magnetic tape so as to minimize errors in the servo pattern, the heads used to write such servo data, and the magnetic tape manufactured with such heads. Errors in the servo pattern may be minimized by synthesizing the slanted transitions in a time based servo pattern using servo write gaps that are perpendicular to the tape motion. In so minimizing errors, distortion in the reading and/or writing of the data tracks can be prevented.
Servo Track Magnetic Recording Head For Pre-Erasing Magnetic Tape
US Patent:
7576949, Aug 18, 2009
Filed:
Aug 13, 2007
Appl. No.:
11/838006
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
Assignee:
Advanced Research Corporation - White Bear Lake MN
International Classification:
G11B 5/127
G11B 5/265
G11B 5/265
US Classification:
360118, 360121
Abstract:
The present invention relates to direct current (“DC”) pre-erasing servo channels of a magnetic tape prior to writing servo data in a servo channel. The present invention particularly relates to those servo recordings which were written with a uni-polar current waveform. The DC pre-erase is performed using a uni-polar direct current of a polarity that is opposite to the polarity of the direct current used to write the servo data. This pre-erase may be done with one or more heads. Also, as will be described, the pre-erase of a servo channel and writing to a servo channel may be done by making two passes over a single head or by using two or more heads to perform both steps. Also, it is within the scope of the present invention to have the heads mounted on a single mount or have the heads on separate mounts and on separate tape decks.
Apparatuses And Methods For Pre-Erasing During Manufacture Of Magnetic Tape
US Patent:
7710675, May 4, 2010
Filed:
Nov 14, 2008
Appl. No.:
12/271203
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
Assignee:
Advanced Research Corporation - White Bear MN
International Classification:
G11B 5/09
G11B 15/18
G11B 15/18
US Classification:
360 48, 360 71
Abstract:
The present invention relates to direct current (“DC”) pre-erasing servo channels of a magnetic tape prior to writing servo data in a servo channel. The present invention particularly relates to those servo recordings which were written with a uni-polar current waveform. The DC pre-erase is performed using a uni-polar direct current of a polarity that is opposite to the polarity of the direct current used to write the servo data. This pre-erase may be done with one or more heads. Also, as will be described, the pre-erase of a servo channel and writing to a servo channel may be done by making two passes over a single head or by using two or more heads to perform both steps. Also, it is within the scope of the present invention to have the heads mounted on a single mount or have the heads on separate mounts and on separate tape decks.
Magnetic Media Formatted With An Intergrated Thin Film Subgap Subpole Structure For Arbitrary Gap Pattern Magnetic Recording Head
US Patent:
8416525, Apr 9, 2013
Filed:
Feb 23, 2011
Appl. No.:
13/032754
Inventors:
Theodore A. Schwarz - Woodbury MN, US
Matthew P. Dugas - St. Paul MN, US
Matthew P. Dugas - St. Paul MN, US
Assignee:
Advanced Research Corporation - White Bear Lake MN
International Classification:
G11B 5/584
G11B 21/02
G11B 21/02
US Classification:
360121, 360 7712
Abstract:
A method of formatting magnetic media includes providing an integrated thin film magnetic recording head having a recording element. The recording element includes first and second magnetically permeable thin film subpole members separated by a substantially low permeability subgap member. An integrated electrically conductive coil structure is embedded in part within the subgap member and in part in-between the first and second subpole members. The recording element also includes a magnetically permeable thin film layer spanning from at least the first subpole member to the second subpole member and including one or more arbitrary recording gap patterns. The direction of film growth of the magnetically permeable thin film layer is substantially orthogonal to the direction of thin film growth of the first and second magnetically permeable thin film subpole members. The method includes passing magnetic media over the magnetic recording head to format the magnetic media.
Magnetic Media Formatted With An Integrated Thin Film Subgap Subpole Structure For Arbitrary Gap Pattern Magnetic Recording Head
US Patent:
2009014, Jun 11, 2009
Filed:
Nov 10, 2008
Appl. No.:
12/268076
Inventors:
Matthew P. Dugas - St. Paul MN, US
Theodore A. Schwarz - Woodbury MN, US
Theodore A. Schwarz - Woodbury MN, US
International Classification:
G11B 5/33
G11B 5/78
G11B 5/78
US Classification:
360121, 360134, G9B 5104, G9B 5291
Abstract:
An arbitrary gap thin film magnetic recording head is fabricated by forming a substrate based on traditional vertical planar thin film head wafer technology which is designed to produce an integrated subgap and subpole substrate structure. The wafer is then processed into row bars to reveal, in a plane parallel to the transducing direction of the medium, the subgap and subpoles at the surface of the row bar and to bring the structure to a certain coil depth or gap depth. A flat or cylindrical contour may be utilized.This thin film subgap row bar is taken through a film deposition or growth process that deposits the magnetic film on a plane perpendicular to the wafer plane, horizontal planar processing, forming a surface film recording head where an arbitrary gap structure can be made in-between the subpoles and generally directly on top of the subgap. The surface thin film is deposited and patterned on the tape bearing surface of the head to optimize various element configurations, gap patterns and head-to-tape medium contact.An arbitrary gap thin film magnetic recording head is manufactured using two major thin film processing planes, one orthogonal to the other, the first major plane is wafer level and the second major plane is sub-wafer level and perpendicular to the first. The first major plane of processing defines the magnetically active substrate including coils, subgap and subpole members. The second major plane of processing defines the surface film which transmits the flux from the subpoles to the gap features contained in the surface film.This resulting structure is a recording head that is wired to the servo system electronics and will format the tape with the arbitrary gap pattern.
Isbn (Books And Publications)
How To Be A Freelance Photographer
Author:
Theodore Schwarz
ISBN #:
0809270625
How To Be A Freelance Photographer
Author:
Theodore Schwarz
ISBN #:
0809270633
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