JOHN Z DING
Engineers in Midlothian, VA

License number
Virginia 0402044684
Issued Date
Apr 15, 2008
Expiration Date
Apr 30, 2018
Category
Professional Engineer License
Type
Professional Engineer
Address
Address
Midlothian, VA
LicenseFiles verified this license of Feb 15, 2017 at the The Virginia Department of Professional and Occupational Regulation.

Professional information

John Ding Photo 1

Ding Inspection Device

US Patent:
8151658, Apr 10, 2012
Filed:
Sep 23, 2010
Appl. No.:
12/888500
Inventors:
John Ding - Midlothian VA, US
International Classification:
E21B 47/00
US Classification:
738658
Abstract:
Visual inspection of an interior bottom of a borehole by means of measuring the sediment thickness at the bottom. An inspection device to be lowered in the borehole and then to be retrieved. The bottom sediment thickness is marked on the piston by a collar attached to the piston.

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