David R Daniel

US Patent:

6366422, Apr 2, 2002

Filed:

Apr 1, 1999

Appl. No.:

09/283170

Inventors:

David B. Daniel - Longmont CO
Fred Eifert - Eaton CO
Douglas Christian Hansen - Boulder CO
David Lawson - Arvada CO
Thai Nguyen - Thornton CO

Assignee:

Storage Technology Corporation - Louisville CO

International Classification:

G11B 500

US Classification:

360 76

Abstract:

It is difficult to read data from curved helical data tracks in a helical scan tape drive. Curved helical tracks can be caused by improper tape tension, tape damage, tape path misalignment, tape head offset between different head systems, and debris. The present invention solves the problem of recovering data from curved helical tracks by providing a table of different curve offset signals. Each curve offset signal represents a curve track profile of a typical curved track. The position of the helical read head reading a curved data track is controlled as a function of one of the curve offset signals such that the read head is positioned properly with respect to the helical data track to provide a proper read back signal. The curve offset signals are selected one at a time to control the position of the helical read head until the helical read head provides a proper read back signal.

US Patent:

6565029, May 20, 2003

Filed:

Jun 20, 2001

Appl. No.:

09/885660

Inventors:

James Zweighaft - Boulder CO
David B. Daniel - Longmont CO

Assignee:

Quantum Corp. - Milpitas CA

International Classification:

G11B 1546

US Classification:

2423344, 2425342, 2425632, 360 71

Abstract:

A method for detecting slippage in a tape path, and re-calibrating a sensing assembly in a tape storage device to account for the slippage. The method includes sensing a position of one of a supply reel and a take-up reel. In response to sensing the position of the supply reel or take-up reel, sensing a position of a guide roller. The position of the guide roller corresponds to the position of the guide roller when the position of the supply reel or the take-up reel is sensed. In response to sensing the position of the guide roller, the tape media is wound through the tape path between the supply reel and the take-up reel. In response to winding the tape media through the tape path, a second position of the one of the supply reel and the take-up reel is sensed. In response to sensing the second position of the one of the supply reel and the take-up reel, a second position of the guide roller is sensed. The second position of the guide roller corresponds to the position of the guide roller when the second position of the one of the supply reel or the take-up reel is sensed.

US Patent:

6568618, May 27, 2003

Filed:

May 23, 2000

Appl. No.:

09/575977

Inventors:

William J. Vanderheyden - Loveland CO
Kevin S. Fletcher - Boulder CO
Michael J. OKeeffe - Boulder CO
David B. Daniel - Longmont CO

Assignee:

Quantum Corporation - Milpitas CA

International Classification:

G11B 1566

US Classification:

2423327, 2423328, 360 93

Abstract:

The half-inch tape drive comprises a novel takeup reel, tape deck, PC board packaging, loading mechanism, and housing. The takeup reel comprises a pair of segmented flanges that define a first and second tape containment section. The tape deck is approximately half the height of a conventional tape deck and includes reinforcing ribs to provide structural rigidity and maintain alignment of the moving components of the tape drive during operation. The loading mechanism comprises a horizontally mounted load motor that employs a worm gear to engage a simplified gear train. The printed circuit board is segmented into multiple sections that are mounted in various locations on the tape drive to maximize spatial efficiencies and reduce the overall height of the tape drive. The tape drive housing provides a protective exterior for the tape drive components and provides the structure for mounting the present tape drive in a single drive bay of a computer housing.

US Patent:

D497499, Oct 26, 2004

Filed:

Jul 7, 2003

Appl. No.:

29/185973

Inventors:

David Michael Daniel - Morganton NC
Colin Guy Treiber - late of Morganton NC

Assignee:

Henredron Furniture Industries, Inc. - Morganton NC

International Classification:

0606

US Classification:

D 6495

US Patent:

D505611, May 31, 2005

Filed:

Jul 7, 2003

Appl. No.:

29/185974

Inventors:

David Michael Daniel - Morganton NC, US
Colin Guy Treiber - Morganton NC, US
by Linda S. Treiber, legal representive - Morganton NC, US

Assignee:

Henredon Furniture Industries, Inc. - Morganton NC

International Classification:

0806

US Classification:

D 8315

US Patent:

6925924, Aug 9, 2005

Filed:

Oct 14, 2003

Appl. No.:

10/684858

Inventors:

Ernest L. Baker - Wantage NJ, US
David C. Daniel - Missouri City TX, US
David S. Wesson - Ft. Worth TX, US
Arthur S. Daniels - Rockaway NJ, US
Robert E. Davis - Joshua TX, US

Assignee:

Molycorp Inc. - Mountain Pass CA

International Classification:

E21B043/116

US Classification:

87 1151

Abstract:

A non-linear shaped charge perforator for use in perforating an oil and gas formation into which a wellbore has been drilled comprises a monolithic, axisymmetric metal case in which is disposed a main explosive charge between the front of the case, which is closed with a concave metal liner, and the closed back end of the case. The main explosive charge contains multiple initiation points, preferably two initiation points located about 180 apart on the outside surface of the charge, so that when the perforator is detonated the main charge is initiated such that the metal liner is collapsed into a non-circular jet, preferably a fan-shaped jet, that pierces the casing of the wellbore and forms non-circular perforations, preferably slot-shaped perforations, in the surrounding formation.

US Patent:

20050188878, Sep 1, 2005

Filed:

Mar 7, 2005

Appl. No.:

11/073235

Inventors:

Ernest Baker - Wantage NJ, US
David Daniel - Missouri City TX, US
David Wesson - Ft. Worth TX, US
John Burba - Boulder City NV, US
Arthur Daniels - Rockaway NJ, US
Robert Davis - Joshua TX, US

International Classification:

F42B012/20

US Classification:

102306000, 102476000

Abstract:

A non-linear shaped charge perforator for use in perforating an oil and gas formation into which a wellbore has been drilled comprises a monolithic, axisymmetric metal case in which is disposed a main explosive charge between the front of the case, which is closed with a concave metal liner, and the closed back end of the case. The main explosive charge contains multiple initiation points, preferably two initiation points located about 180 apart on the outside surface of the charge, so that when the perforator is detonated the main charge is initiated such that the metal liner is collapsed into a non-circular jet, preferably a fan-shaped jet, that pierces the casing of the wellbore and forms non-circular perforations, preferably slot-shaped perforations, in the surrounding formation.