Covered Property (1)

Related Assignments (14)

Other recorded transfers of the patent in this record — the chain of ownership.

Security Interest Jul 19, 1993

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC. A CORP. OF TEXAS

To: FIRST NATIONAL BANK OF BOSTON, THE A NATIONAL BANKING ASSOCIATION

Reel/Frame 006617/0253 →

Security Interest Aug 25, 1993

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC., A TEXAS CORPORATION

To: FIRST NATIONAL BANK OF BOSTON, THE

Reel/Frame 006661/0857 →

Security Interest Oct 30, 1997

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC.; DRILLTEC TECHNOLOGIES, INC.; DRILLTEC INTERNATIONAL LIMITED; DRILLTEC INDONESIA, INC.

To: HELLER FINANCIAL, INC.

Reel/Frame 008723/0183 →

Termination and Release of Security Interest in Patents May 27, 1998

From: BANKBOSTON, N.A., BY CHANGE OF NAME FROM FIRST NATIONAL BANK OF BOSTON

To: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC.

Reel/Frame 009187/0520 →

Security Agreement Sep 3, 1998

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC.

To: FIRST SOURCE FINANCIAL LLP

Reel/Frame 009414/0400 →

Security Agreement Sep 14, 1998

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC.

To: ALLIED CAPITAL CORPORATION

Reel/Frame 009445/0819 →

Security Interest Feb 15, 2001

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC.

To: ALLIED CAPITAL CORPORATION; EQUUS II INCORPORATED

Reel/Frame 011523/0614 →

Amendment & Assignment of Agreement Nov 13, 2001

From: FIRST SOURCE FINANCIAL LLP

To: FIRST SOURCE FINANCIAL, INC.

Reel/Frame 012302/0528 →

Release of Lien on Patents Jun 28, 2002

From: HELLER FINANCIAL, INC.

To: DRILLTEC PATENTS & TECHNOLOGIES,

Reel/Frame 013645/0661 →

Release of Security Interest Jul 18, 2002

From: HELLER FINANCIAL, INC.; DRILLTEC TECHNOLOGIES, INC.; DRILLTEC INTERNATIONAL LIMITED; DRILLTEC INDONESIA, INC.

To: PETER J. HUDSON, CFO

Reel/Frame 013097/0833 →

Security Interest Oct 1, 2002

From: DRILLTEC PATENT & TECHNOLOGIES COMPANY, INC.

To: ALLIED CAPITAL CORPORATION

Reel/Frame 013343/0518 →

Security Agreement May 24, 2007

From: DT-HP TEXAS OPERATING CORPORATION; DT-HP PATENTS AND TECHNOLOGIES CORPORATION

To: AMEGY BANK NATIONAL ASSOCIATION

Reel/Frame 019331/0756 →

Assignment of Assignor's Interest Jun 11, 2007

From: DRILLTEC PATENTS & TECHNOLOGIES COMPANY, INC., A DELAWARE CORPORATION; DRILLTEC TECHNOLOGIES, L.P., A DELAWARE LIMITED PARTNERSHIP

To: DT-HP PATENTS AND TECHNOLOGIES CORPORATION, A DELAWARE CORPORATION

Reel/Frame 019407/0123 →

Change of Name Dec 13, 2007

From: DT-HP PATENTS AND TECHNOLOGIES CORPORATION

To: DRILLTEC PATENTS & TECHNOLOGIES CORPORATION

Reel/Frame 020243/0443 →