Patents by Inventor Clark Milo Janssen
Clark Milo Janssen has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Patent number: 7100858Abstract: The self-centering tape reel for a single reel tape cartridge provides a magnetic tape reel that is equipped with one or more features to center the tape reel with respect to a rotatably driven feature, such as a drive chuck, in the tape drive that rotates the tape reel. The self-centering tape reel uses a chamfered ring that encircles the drive teeth formed on the tape reel that engage the drive chuck. The chamfered ring fits into a chamfer that is formed in the circumference of the spline access hole located in the bottom of the tape cartridge housing.Type: GrantFiled: October 15, 2001Date of Patent: September 5, 2006Assignee: Quantum CorporationInventors: Henrik Vladimir Nejezchleb, Clark Milo Janssen
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Patent number: 6891695Abstract: A compact tape drive for reading and writing data on single reel magnetic tape cartridges. The compact tape drive has a tape threading mechanism that extracts the leader block from the magnetic tape cartridge and threads the leader block into a takeup reel that is located juxtaposed to the loaded magnetic tape cartridge. A separate magnetic tape wrap mechanism having a plurality of cooperatively operative tape wrap arms is also provided to position the magnetic tape around a set of tape guides and the read/write head. The magnetic tape wrap mechanism functions both to thread the magnetic around the takeup reel, spanning the space in front of the read/write head, and then to wrap the magnetic tape around the read/write head. In addition, the tape elevator, electronics and other standard tape drive assemblies are included in a predefined volume.Type: GrantFiled: July 8, 1998Date of Patent: May 10, 2005Assignee: Storage Technology CorporationInventors: Joseph Philip Falace, Wayne Richard Hemzacek, David Thomas Hoge, Clark Milo Janssen, Donovan Milo Janssen, Donald Wayne Selg, John Sam Todor
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Patent number: 6801383Abstract: A staggered calibration track comprising a plurality of calibration tracks for use positioning a tape drive tape head for reading and writing data to and from multiple data tracks. The staggered calibration track is written by positioning the write head to a predetermined location and moving the tape media horizontally as the vertical position of the tape head is incremented in a stepwise alignment. Locating one of the plurality of calibration tracks is accomplished by positioning the read head at the predetermined location corresponding to the edge of the particular calibration track and moving the tape media horizontally as the read head output is recorded. The particular calibration tracks vertical position is derived using the average read head output.Type: GrantFiled: April 4, 2002Date of Patent: October 5, 2004Assignee: Quantum CorporationInventors: James Zweighaft, Clark Milo Janssen, Timothy Joe Kindvall
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Publication number: 20040149850Abstract: The self-centering tape reel for a single reel tape cartridge provides a magnetic tape reel that is equipped with one or more features to center the tape reel with respect to a rotatably driven feature, such as a drive chuck, in the tape drive that rotates the tape reel. The self-centering tape reel uses a chamfered ring that encircles the drive teeth formed on the tape reel that engage the drive chuck. The chamfered ring fits into a chamfer that is formed in the circumference of the spline access hole located in the bottom of the tape cartridge housing.Type: ApplicationFiled: December 17, 2003Publication date: August 5, 2004Inventors: Vladimir Henrik Nejezchleb, Clark Milo Janssen
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Patent number: 6665137Abstract: According to the present method a plurality of vertically adjacent reference tracks corresponding to a plurality of vertically adjacent data tracks are written to the tape media so that each data track includes a dedicated reference track that is used to locate that data track. To locate a desired data track, the tape head assembly is used to locate a boundary between a reference track corresponding to a desired data track and an adjacent reference track. Using the boundary as a reference point, the tape head assembly is aligned with the desired reference track and the tape media wound through the tape path to read or right data to the corresponding track.Type: GrantFiled: June 7, 2001Date of Patent: December 16, 2003Assignee: Quantum CorporationInventors: James Zweighaft, Clark Milo Janssen
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Publication number: 20030189783Abstract: A staggered calibration track comprising a plurality of calibration tracks for use positioning a tape drive tape head for reading and writing data to and from multiple data tracks. The staggered calibration track is written by positioning the write head to a predetermined location and moving the tape media horizontally as the vertical position of the tape head is incremented in a stepwise alignment. Locating one of the plurality of calibration tracks is accomplished by positioning the read head at the predetermined location corresponding to the edge of the particular calibration track and moving the tape media horizontally as the read head output is recorded. The particular calibration tracks vertical position is derived using the average read head output.Type: ApplicationFiled: April 4, 2002Publication date: October 9, 2003Applicant: Benchmark Storage Innovations, Inc.Inventors: James Zweighaft, Clark Milo Janssen, Timothy Joe Kindvall
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Publication number: 20020191324Abstract: According to the present method a plurality of vertically adjacent reference tracks corresponding to a plurality of vertically adjacent data tracks are written to the tape media so that each data track includes a dedicated reference track that is used to locate that data track. To locate a desired data track, the tape head assembly is used to locate a boundary between a reference track corresponding to a desired data track and an adjacent reference track. Using the boundary as a reference point, the tape head assembly is aligned with the desired reference track and the tape media wound through the tape path to read or right data to the corresponding track.Type: ApplicationFiled: June 7, 2001Publication date: December 19, 2002Applicant: Benchmark Storage Innovations, Inc.Inventors: James Zweighaft, Clark Milo Janssen
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Patent number: 6441990Abstract: The present compact tape drive for reading and writing data on single reel magnetic tape cartridges that functions to implement the tape drive in a minimum predefined volume. The compact tape drive comprises a tape threading mechanism that extracts the leader block from the magnetic tape cartridge and threads the leader block into a takeup reel that is located juxtaposed to the loaded magnetic tape cartridge. The read/write head is located adjacent to the takeup reel and the loaded magnetic tape cartridge. A separate magnetic tape wrap mechanism comprising a plurality of cooperatively operative tape wrap arms is also provided to position the magnetic tape around a set of tape guides and the read/write head. The magnetic tape wrap mechanism functions both to thread the magnetic tape around the takeup reel, spanning the space in front of the read/write head, and then to wrap the magnetic tape around the read/write head.Type: GrantFiled: February 28, 2001Date of Patent: August 27, 2002Assignee: Storage Technology CorporationInventors: Joseph Philip Falace, Wayne Richard Hemzacek, David Thomas Hoge, Clark Milo Janssen, Donovan Milo Janssen, Donald Wayne Selg, John Sam Todor
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Publication number: 20010007518Abstract: The present compact tape drive for reading and writing data on single reel magnetic tape cartridges that functions to implement the tape drive in a minimum predefined volume. The compact tape drive comprises a tape threading mechanism that extracts the leader block from the magnetic tape cartridge and threads the leader block into a takeup reel that is located juxtaposed to the loaded magnetic tape cartridge. The read/write head is located adjacent to the takeup reel and the loaded magnetic tape cartridge. A separate magnetic tape wrap mechanism comprising a plurality of cooperatively operative tape wrap arms is also provided to position the magnetic tape around a set of tape guides and the read/write head. The magnetic tape wrap mechanism functions both to thread the magnetic tape around the takeup reel, spanning the space in front of the read/write head, and then to wrap the magnetic tape around the read/write head.Type: ApplicationFiled: February 28, 2001Publication date: July 12, 2001Applicant: Storage Technology CorporationInventors: Joseph Philip Falace, Wayne Richard Hemzacek, David Thomas Hoge, Clark Milo Janssen, Donovan Milo Janssen, Donald Wayne Selg, John Sam Todor
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Patent number: 6116535Abstract: A mechanism and method for guiding a tape across a transducer, and a method for making the mechanism. The mechanism has one rolling guide on either side of the transducer. Each guide has a tapered surface and a flange at one end of the tapered surface. Each tapered surface biases one edge of the tape against a flange to fix the tape's position in the transverse direction on opposite sides of the transducer. The taper of the first and second guides are oriented in opposite directions.Type: GrantFiled: June 22, 1999Date of Patent: September 12, 2000Assignee: Storage Technology CorporationInventors: Donald Wayne Selg, Clark Milo Janssen, Joseph Philip Falace
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Patent number: 5973876Abstract: A data cartridge shuttle apparatus (100) is used to permit a robotic hand (40) to insert and remove a data cartridge (246) into and out of a manual cartridge drive mechanism (20). A pawl and lever linkage (104) is rotated to open and close a handle (26) of the tape drive mechanism by contact with a pawl stop (134), which is mounted on a spring-biased sliding block/plate assembly (106). The sliding block/plate assembly has a triangular clasp (228) that engages the data cartridge for extraction of the tape cartridge from the drive bay to a point where the robotic hand can grasp and remove it.Type: GrantFiled: May 14, 1996Date of Patent: October 26, 1999Assignee: Storage Technology CorportionInventors: Lester Marvin Yeakley, Clark Milo Janssen, Joseph Paul Manes, Daniel J. Plutt, John S. Todor