The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2016
Filed:
Sep. 03, 2013
Robert Benjamin Donnally, Shanghai, CN;
Chunqiao Ren, Shanghai, CN;
Stuart Arthur Lyall Mccurdy, Edmonton, CA;
Xi Lin Liu, Henan, CN;
Hui Chun Sheng, Shanghai, CN;
Yan Yu, Shanghai, CN;
Robert Benjamin Donnally, Shanghai, CN;
Chunqiao Ren, Shanghai, CN;
Stuart Arthur Lyall McCurdy, Edmonton, CA;
Xi Lin Liu, Henan, CN;
Hui Chun Sheng, Shanghai, CN;
Yan Yu, Shanghai, CN;
National Oilwell Varco, L.P., Houston, TX (US);
Abstract
A system for erecting a drilling rig mast includes a substructure having an open area that is defined therein by two laterally spaced-apart substructure sides and a first mast section that is adapted to be positioned at least partially within the open area of the substructure after the first mast section has been removably connected to the substructure. The system further includes, among other things, a second mast section that is adapted to be removably connected to the first mast section the said first mast section has been removably connected to the substructure, and a mast connection apparatus that is adapted to removably connect the second mast section to the first mast section when an upper end of the first mast section is raised relative to a lower end of the second mast section.