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:
May. 12, 2015
Filed:
Jan. 06, 2012
Yaoqing Pan, Panjin, CN;
Yongning Wu, Panjin, CN;
Jinli Zhu, Panjin, CN;
Xiaohui Zhang, Panjin, CN;
Wei Zhang, Panjin, CN;
Zhenyu Xu, Panjin, CN;
Zhenyu Jia, Panjin, CN;
Ji Chen, Panjin, CN;
Yi Wang, Panjin, CN;
Yaoqing Pan, Panjin, CN;
Yongning Wu, Panjin, CN;
Jinli Zhu, Panjin, CN;
Xiaohui Zhang, Panjin, CN;
Wei Zhang, Panjin, CN;
Zhenyu Xu, Panjin, CN;
Zhenyu Jia, Panjin, CN;
Ji Chen, Panjin, CN;
Yi Wang, Panjin, CN;
General Machinery Plant of Liaohe Petroleum Exploration Bureau of CNPC, Panjin, Liaoning Province, CN;
Abstract
The present invention relates to a pre-stressed insulated tubing, including an inner tube () and an outer tube () nested outside of the inner tube (), and a closed ring cavity is formed between the inner tube () and the outer tube (), wherein an insulated casing () is arranged in the closed ring cavity. The pre-stressed insulated tubing of the present invention features high vacuum degree, high thermal insulation level and long working life, and the insulated casing is reusable for cost saving.