Patents by Inventor Dongfa Li

Dongfa Li has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11976891
    Abstract: The present invention relates to the field of fluid heat transfer, and discloses a heat transfer enhancement pipe as well as a cracking furnace and an atmospheric and vacuum heating furnace including the same. The heat transfer enhancement pipe (1) includes a pipe body (10) of tubular shape having an inlet (100) for entering of a fluid and an outlet (101) for said fluid to flow out; internal wall of the pipe body (10) is provided with a fin (11) protruding towards interior of the pipe body (10), the fin (11) spirally extends in an axial direction of the pipe body (10), wherein a height of the fin (11) gradually increases from one end in at least a part extension of the fin. The heat transfer enhancement pipe can reduce thermal stress of itself, thereby increasing service life of the heat transfer enhancement pipe.
    Type: Grant
    Filed: October 25, 2018
    Date of Patent: May 7, 2024
    Assignees: China Petroleum & Chemical Corporation, Beijing Research Institute of Chemical Industry, China Petroleum & Chemical Corporation
    Inventors: Guoqing Wang, Junjie Liu, Lijun Zhang, Cong Zhou, Zhaobin Zhang, Shasha Yang, Dongfa Shen, Xiaofeng Li, Shifang Yang, Zhiguo Du, Yonggang Zhang, Ying Shi, Jinghang Guo
  • Patent number: 10583302
    Abstract: The application of a titanium hydride coating on a ceramic, preferably an alumina ceramic, as a facile and inexpensive approach to bond gold to the ceramic during brazing is described. During the brazing process, the deposited titanium hydride is first partially decomposed to form pure titanium intermixed with titanium hydride. The combination of pure titanium and titanium hydride contributes to improved adhesion of gold with the alumina ceramic without any detrimental reaction between pure titanium and gold. The titanium hydride coating can be applied by dip/spray/paint coating.
    Type: Grant
    Filed: September 22, 2017
    Date of Patent: March 10, 2020
    Assignee: Greatbatch Ltd.
    Inventors: Dongfa Li, Biswa P. Das, Ashish Shah
  • Publication number: 20180085591
    Abstract: The application of a titanium hydride coating on a ceramic, preferably an alumina ceramic, as a facile and inexpensive approach to bond gold to the ceramic during brazing is described. During the brazing process, the deposited titanium hydride is first partially decomposed to form pure titanium intermixed with titanium hydride. The combination of pure titanium and titanium hydride contributes to improved adhesion of gold with the alumina ceramic without any detrimental reaction between pure titanium and gold. The titanium hydride coating can be applied by dip/spray/paint coating.
    Type: Application
    Filed: September 22, 2017
    Publication date: March 29, 2018
    Inventors: Dongfa Li, Biswa P. Das, Ashish Shah
  • Patent number: 8642887
    Abstract: A metallization that includes a composite of alternating metal and metal oxide layers for incorporation into feedthrough filter capacitor assemblies is described. The feedthrough filter capacitor assemblies are particularly useful for incorporation into implantable medical devices such as cardiac pacemakers, cardioverter defibrillators, and the like, to decouple and shield internal electronic components of the medical device from undesirable electromagnetic interference (EMI) signals.
    Type: Grant
    Filed: December 5, 2011
    Date of Patent: February 4, 2014
    Assignee: Greatbatch Ltd.
    Inventors: Dongfa Li, Ashish Shah
  • Patent number: 8216398
    Abstract: An efficient method to reduce product wastes due to inaccurate transformation temperatures for shape memory products and parts, which provides a useful method for optimizing shape memory alloys phase transformation temperatures and mechanical properties by using heat treatment procedures below 250 degrees C. for extended dwell times.
    Type: Grant
    Filed: May 17, 2010
    Date of Patent: July 10, 2012
    Assignee: Saint Louis University
    Inventors: John Gary Bledsoe, Berton Roy Moed, Dongfa Li
  • Publication number: 20110277890
    Abstract: An efficient method to reduce product wastes due to inaccurate transformation temperatures for shape memory products and parts, which provides a useful method for optimizing shape memory alloys phase transformation temperatures and mechanical properties by using heat treatment procedures below 250 degrees C. for extended dwell times.
    Type: Application
    Filed: May 17, 2010
    Publication date: November 17, 2011
    Applicant: Saint Louis University
    Inventors: John Gary Bledsoe, Berton Roy Moed, Dongfa Li