Patents by Inventor Jen-Chun Chang

Jen-Chun Chang 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: 7488860
    Abstract: An exo-tetrahydrodicyclopentadiene is produced from endo-tetrahydrodicyclopentadiene through isomerization reaction. An acidic ionic liquid is used in the isomerization. The isomerization of endo-tetrahydrodicyclopentadiene gives a reaction conversion and a selectivity both higher than 99%. Besides, the ionic liquid used is environmental-friendly and recyclable.
    Type: Grant
    Filed: September 13, 2006
    Date of Patent: February 10, 2009
    Assignee: Chinese Petroleum Corp.
    Inventors: Ming-Yu Huang, Jen-Chun Chang, Jann-Chen Lin, Kun-Hai Lin, Jung-Chung Wu
  • Publication number: 20080269533
    Abstract: A method of selectively hydrogenating a conjugated diene by using a supported ionic liquid nano-palladium catalyst. The supported ionic liquid nano-palladium catalyst, hydrogen and a reactant having the conjugated diene react at a temperature ranging from 40 to 120° C. and a pressure ranging from 100 to 400 psig. A ratio of the catalyst to the reactant ranges from 1/20 to 1/250 (g/ml).
    Type: Application
    Filed: September 14, 2007
    Publication date: October 30, 2008
    Inventors: Jen-Chun Chang, Jann-Chen Lin, Chia-Ying Lee, Guor-Tzo Wei, Jung-Chung Wu
  • Publication number: 20080064909
    Abstract: An exo-tetrahydrodicyclopentadiene is produced from endo-tetrahydrodicyclopentadiene through isomerization reaction. An acidic ionic liquid is used in the isomerization. The isomerization of endo-tetrahydrodicyclopentadiene gives a reaction conversion and a selectivity both higher than 99%. Besides, the ionic liquid used is environmental-friendly and recyclable.
    Type: Application
    Filed: September 13, 2006
    Publication date: March 13, 2008
    Applicant: CHINESE PETROLEUM CORP.
    Inventors: Ming-Yu Huang, Jen-Chun Chang, Jann-Chen Lin, Kun-Hai Lin, Jung-Chung Wu
  • Patent number: 7071403
    Abstract: A method of providing MIDI function on a portable device. The method includes setting a MIDI setting table on the device, according to which, the portable device can provide MIDI editing, recording, playing, and output functionality.
    Type: Grant
    Filed: January 27, 2003
    Date of Patent: July 4, 2006
    Assignee: Benq Corporation
    Inventor: Jen-Chun Chang
  • Publication number: 20060094432
    Abstract: A method of performing a handoff in a mobile communication system includes measuring signal strength of signals received by a mobile station from an active base station and comparing the measured signal strength of the active base station with a first threshold value. If the measured signal strength of the active base station is less than the first threshold value, the signal strength of neighboring base stations is measured for identifying a candidate base station, which is a neighboring base station with the highest signal strength. The method also includes handing off from the active base station to the candidate base station if the measured signal strength of the active base station is less than the first threshold value and greater than a second threshold value, and if signal strength of the candidate base station is greater than the signal strength of the active base station by a predetermined value.
    Type: Application
    Filed: November 3, 2004
    Publication date: May 4, 2006
    Inventors: Jen-Chun Chang, Tzeng-Chih Chiou
  • Publication number: 20040204062
    Abstract: A method of providing MIDI function on a portable device. The method includes setting a MIDI setting table on the device, according to which, the portable device can provide MIDI editing, recording, playing, and output functionality.
    Type: Application
    Filed: January 27, 2003
    Publication date: October 14, 2004
    Applicant: BENQ CORPORATION
    Inventor: Jen-Chun Chang
  • Patent number: 6728349
    Abstract: A method for notifying and reminding phone users of missed calls. The method is characterized in that when an incoming call is unanswered, the telephone notifies and subsequently reminds the user of the incoming call at a time period interval in a predetermined manner.
    Type: Grant
    Filed: April 10, 2003
    Date of Patent: April 27, 2004
    Assignee: Benq Corporation
    Inventors: Jen-Chun Chang, Huang-Fu Teng
  • Publication number: 20030200173
    Abstract: A method for requesting personalized bill information with a short message service. A mobile communication system comprises a mobile station (MS), a service center (SC) having a bill information database, wherein matching a bill information request with the bill information database to construct a personalized bill information and transmitting a short message including the personalized bill information to the MS, and a plurality of bill information types in the bill information database; and a method for requesting personalized bill information with a short message service, comprising the steps of constructing a personalized bill information request on the MS, transmitting bill information request from the MS to the SC, constructing a personalized bill information response by accessing the bill information database according to the personalized bill information request, and transmitting the personalized bill information response from the SC to the MS.
    Type: Application
    Filed: April 17, 2003
    Publication date: October 23, 2003
    Applicant: BENQ CORPORATION
    Inventor: Jen-chun Chang
  • Publication number: 20030198324
    Abstract: A method for notifying and reminding phone users of missed calls. The method is characterized in that when an incoming call is unanswered, the telephone notifies and subsequently reminds the user of the incoming call at a time period interval in a predetermined manner.
    Type: Application
    Filed: April 10, 2003
    Publication date: October 23, 2003
    Applicant: BENO CORPORATION
    Inventors: Jen-Chun Chang, Huang-Fu Teng