Christopher Lloyd Drenth

US Patent:

D620959, Aug 3, 2010

Filed:

Jan 29, 2010

Appl. No.:

29/354935

Inventors:

Christopher L. Drenth - Draper UT, US
Hongyan Zhang - Wuxi, CN

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

1509

US Classification:

D15138

US Patent:

D622293, Aug 24, 2010

Filed:

Dec 15, 2009

Appl. No.:

29/352055

Inventors:

Christopher L Drenth - Draper UT, US
George Ibrahim - Mississauga, CA
Sacha Tillack - North Bay, CA

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

1503

US Classification:

D15 21

US Patent:

D622294, Aug 24, 2010

Filed:

Dec 16, 2009

Appl. No.:

29/352117

Inventors:

Christopher L Drenth - Draper UT, US
George Ibrahim - Mississauga, CA
Sacha Tillack - North Bay, CA

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

1503

US Classification:

D15 21

US Patent:

D622741, Aug 31, 2010

Filed:

Dec 16, 2009

Appl. No.:

29/352115

Inventors:

Christopher L Drenth - Draper UT, US
George Ibrahim - Mississauga CA, US
Sacha Tillack - North Bay CA, US

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

1503

US Classification:

D15 21

US Patent:

D624564, Sep 28, 2010

Filed:

Dec 15, 2009

Appl. No.:

29/352049

Inventors:

Christopher L Drenth - Draper UT, US
George Ibrahim - Mississauga, CA
Sacha Tillack - North Bay, CA

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

1503

US Classification:

D15 21

US Patent:

D625346, Oct 12, 2010

Filed:

Jan 29, 2010

Appl. No.:

29/354930

Inventors:

Christopher L. Drenth - Draper UT, US
Hongyan Zhang - Wuxi, CN

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

1509

US Classification:

D15138

US Patent:

7921926, Apr 12, 2011

Filed:

Jan 6, 2009

Appl. No.:

12/349431

Inventors:

Christopher L. Drenth - Draper UT, US
George Ibrahim - Mississauga, CA
Anthony Lachance - North Bay, CA

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

E21B 19/00
E21B 23/00
E21B 31/00

US Classification:

166385, 166237, 294 8613

Abstract:

A jointed spearhead assembly can include a base portion that is adapted to be connected to a down-hole object and a spearhead portion having a first end and a second. The second end includes a follower tab with a non-convex first follower interface. The spearhead portion can be pivotally coupled to the base portion.

US Patent:

7967085, Jun 28, 2011

Filed:

Apr 21, 2009

Appl. No.:

12/427586

Inventors:

Christopher L. Drenth - Draper UT, US

Assignee:

Longyear TM, Inc. - South Jordan UT

International Classification:

E21B 25/02

US Classification:

175244, 175 58

Abstract:

A braking device for drilling operations in a borehole includes a brake retainer having a plurality of brake connector openings defined therein, a body member having a tapered surface having a first diameter and a second diameter, the second diameter being larger than the first diameter, at least one brake element positioned at least partially between the brake retainer and the body member and in communication with the tapered surface and at least one of the brake connector openings, and a bias member configured to exert a biasing force on the body member to move the body member toward the brake retainer to move the brake element from contact with the first diameter of the tapered surface toward contact with the second diameter.