Patents by Inventor Yen-Fu Liu

Yen-Fu Liu 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: 7600907
    Abstract: An LED lighting device includes a light pipe and a support portion. The light pipe includes a light emitting diode module inside and two first fastening portions on an outer wall thereof. A support portion secures the light pipe and provides a rotatable function for the light pipe. The support portion further includes a clamp and a base member. A clamp has two second fastening portions at opposite sides thereof. The second fastening portions engage with the first fastening portions. The clamp further includes a strip hollow slot. A base member includes a pair of positioning portions for holding an outer wall of the clamp, wherein a fastener is led through the strip hollow slot and fastened on the base member. The clamp slides relative to the base member along the strip hollow slot such that the light pipe rotates relative to the base member.
    Type: Grant
    Filed: September 21, 2007
    Date of Patent: October 13, 2009
    Assignee: Ledtech Electronics Corp.
    Inventors: Yen-Fu Liu, Hung-Hsin Lee
  • Patent number: 7570759
    Abstract: A method for encrypting a message containing a plurality of message segments is described. First, a key is input into a SHA function to generate a first hash value. Then, a first message segment is encrypted into a first cipher segment by use of a part of the first hash value. Next, the first message segment and the first hash value are input into the SHA function to generate a second hash value. Following that, the second message segment is encrypted into a second cipher segment by use of a part of the second hash value. Subsequently, next message segment is repeatedly encrypted and input into the SHA function to generate a next cipher segment and a next hash value, respectively, until the last message segment is encrypted and the last hash value is generated.
    Type: Grant
    Filed: August 13, 2004
    Date of Patent: August 4, 2009
    Inventor: Yen-Fu Liu
  • Publication number: 20090184934
    Abstract: A method for determining the number of fingers on a sensing device, which has a plurality of scanlines, includes the steps of: identifying the scanlines that generate a detecting signal, which has a value greater than a threshold value; finding adjacent ones of the scanlines; forming at least one group from the adjacent ones of the scanlines thus found; and counting the number of the scanlines in the at least one group thus formed in order to determine the number of fingers on the sensing device.
    Type: Application
    Filed: July 1, 2008
    Publication date: July 23, 2009
    Inventors: Jao-Ching Lin, Linabel Chu, Yen-Fu Liu, John Shen
  • Patent number: 7556396
    Abstract: A lamp assembly includes at least one electrical socket and a tube. The electrical socket includes an insulating body and two connectors set in the insulating body. The insulating body has an insertion hole. The two connectors have a contact plate exposed in the insertion hole. The tube has two terminal lugs disposed at least at one end thereof. The end of the tube and the two terminal lugs are inserted and installed in the insertion hole of the electrical socket. The terminal lugs electrically contact the contact plate of the connector. The end of the tube installed in the insertion hole is rotatable, the lighting angle can be adjusted. Thus, the tube can be electrically connected with the electrical socket quickly, the tube is lit instantly, and the tube can be rotated to adjust the lighting angle.
    Type: Grant
    Filed: November 8, 2007
    Date of Patent: July 7, 2009
    Assignee: Ledtech Electronics Corp.
    Inventors: Shu-Hsiung Kuo, Yen-Fu Liu, Yu-Yang Liu
  • Publication number: 20090135602
    Abstract: An assembly of a lighting unit and a receptacle unit includes at least one receptacle unit and at least one lighting unit. The receptacle unit has an outer housing provided with at least one first connection portion and at least one second connection portion electrically connected to the first connection portion in the outer housing. The lighting unit is electrically connected to one of the first and second connection portions of the receptacle unit, so that the lighting unit and the receptacle unit can be independently rotated in relation to each other along a connection axis thereof.
    Type: Application
    Filed: November 28, 2007
    Publication date: May 28, 2009
    Applicant: LEDTECH ELECTRONICS CORP.
    Inventors: Yen-Fu Liu, Chien-Hung Tsai, Hsuan-Hui Chen
  • Publication number: 20090122543
    Abstract: A lamp assembly includes at least one electrical socket and a tube. The electrical socket includes an insulating body and two connectors set in the insulating body. The insulating body has an insertion hole. The two connectors have a contact plate exposed in the insertion hole. The tube has two terminal lugs disposed at least at one end thereof The end of the tube and the two terminal lugs are inserted and installed in the insertion hole of the electrical socket. The terminal lugs electrically contact the contact plate of the connector. The end of the tube installed in the insertion hole is rotatable, the lighting angle can be adjusted. Thus, the tube can be electrically connected with the electrical socket quickly, the tube is lit instantly, and the tube can be rotated to adjust the lighting angle.
    Type: Application
    Filed: November 8, 2007
    Publication date: May 14, 2009
    Inventors: Shu-Hsiung Kuo, Yen-Fu Liu, Yu-Yang Liu
  • Publication number: 20090114518
    Abstract: A touch pad includes a first substrate, a second substrate and a joining layer. The joining layer joins the first substrate and the second substrate together. The first substrate provides a refection layer at a lateral side or both sides thereof with at least a light emitting component being disposed at the periphery of said reflection layer. The second substrate provides an electrical circuit with a first conductor to connect with the light emitting component. The reflection layer is provided with a size less than said first substrate and has an upper side to adhere said first substrate so as to be fixed in said joining layer. the electrical circuit is capable of determining if the touch pad is touched with an object by means of receiving a change of coupling capacity of a sensing locus and capable of controlling luminosity of said light emitting component.
    Type: Application
    Filed: November 1, 2007
    Publication date: May 7, 2009
    Inventors: Jao-Ching Lin, Chung-Yi Shen, Lin-Abel Chu, Yen-Fu Liu
  • Publication number: 20090040782
    Abstract: An LED lighting device includes a light pipe and a support portion. The light pipe includes a light emitting diode module inside and two first fastening portions on an outer wall thereof. A support portion secures the light pipe and provides a rotatable function for the light pipe. The support portion further includes a clamp and a base member. A clamp has two second fastening portions at opposite sides thereof. The second fastening portions engage with the first fastening portions. The clamp further includes a strip hollow slot. A base member includes a pair of positioning portions for holding an outer wall of the clamp, wherein a fastener is led through the strip hollow slot and fastened on the base member. The clamp slides relative to the base member along the strip hollow slot such that the light pipe rotates relative to the base member.
    Type: Application
    Filed: September 21, 2007
    Publication date: February 12, 2009
    Applicant: LEDTECH ELECTRONICS CORP.
    Inventors: Yen-Fu Liu, Hung-Hsin Lee
  • Publication number: 20080198590
    Abstract: A male terminal cap and a female terminal cap are mounted on the two ends of a strip light shade to form an extensible strip light shade. Electrical contacts are formed in the terminal caps for electrical coupling when two light shades are connected through mechanical coupling of the terminal caps.
    Type: Application
    Filed: May 2, 2007
    Publication date: August 21, 2008
    Applicant: LEDTECH ELECTRONICS CORP.
    Inventors: Shu Shoung KUO, Yen Fu LIU, Yu Yang LIU
  • Patent number: 7346816
    Abstract: A method for testing a memory includes a test pattern generated by a hash algorithm. The test pattern is written into the memory and then is read from the memory. Next, the hash algorithm generates a signature using the test pattern read from the memory. Subsequently, the memory is verified by comparing the signature to a reference signature.
    Type: Grant
    Filed: September 29, 2004
    Date of Patent: March 18, 2008
    Inventor: Yen-Fu Liu
  • Publication number: 20060069966
    Abstract: A method for testing a memory is described. The method includes the following steps. First, a test pattern is generated by a hash algorithm. Then, the test pattern is written into the memory. Next, the test pattern is read from the memory. Following that, a signature is generated by the hash algorithm using the test pattern read from the memory. Subsequently, the memory is verified by comparing the signature to a reference signature.
    Type: Application
    Filed: September 29, 2004
    Publication date: March 30, 2006
    Inventor: Yen-Fu Liu
  • Patent number: 7020570
    Abstract: An accelerated test method for testing an integrated circuit is described. The accelerated test method has the following steps. First, test vector data is taken as input to the integrated circuit to produce response data as output. Next, a one-way-hash function is used to transform the response data into a test message digest. Next, the test message digest is verified against a standard message digest to determine whether the test message digest meet a predetermined requirement. The one-way-hash function is embedded as part of the BIST circuit in the integrated circuit or implemented within automated test equipment.
    Type: Grant
    Filed: November 17, 2003
    Date of Patent: March 28, 2006
    Inventor: Yen-Fu Liu
  • Publication number: 20060034453
    Abstract: A method for encrypting a message containing a plurality of message segments is described. First, a key is input into a SHA function to generate a first hash value. Then, a first message segment is encrypted into a first cipher segment by use of a part of the first hash value. Next, the first message segment and the first hash value are input into the SHA function to generate a second hash value. Following that, the second message segment is encrypted into a second cipher segment by use of a part of the second hash value. Subsequently, next message segment is repeatedly encrypted and input into the SHA function to generate a next cipher segment and a next hash value, respectively, until the last message segment is encrypted and the last hash value is generated.
    Type: Application
    Filed: August 13, 2004
    Publication date: February 16, 2006
    Applicant: Yen-Fu Liu
    Inventor: Yen-Fu Liu
  • Publication number: 20040260740
    Abstract: A method of completing the Secure Hash Algorithm (SHA-1) computation in exactly 81 clock cycles with digital hardware. The general implementation techniques include: using a combination of synchronous storage elements to store the required computation values and asynchronous circuits to perform all the logic and mathematic operations of each step of the 81-step SHA-1 computation within a single clock cycle; using a quad-output-channel 16×32-bit circular queue memory to store the 512-bit message segment (block), as a computation buffer of the Wt parameter, and to supply the Wt-3, Wt-8, Wt-14, and Wt-16 data parameters simultaneously; using a combination of a counter circuit and a decoder/encoder circuit to control selecting data parameters and sequencing the 81-step SHA-1 computation; and using an automated controller to control internal units that perform SHA-1 and allowing external systems to access the SHA-1 computation service.
    Type: Application
    Filed: November 12, 2003
    Publication date: December 23, 2004
    Inventor: Yen-Fu Liu
  • Publication number: 20040260502
    Abstract: An accelerated test method for testing an integrated circuit is described. The accelerated test method has the following steps. First, test vector data is taken as input to the integrated circuit to produce response data as output. Next, a one-way-hash function is used to transform the response data into a test message digest. Next, the test message digest is verified against a standard message digest to determine whether the test message digest meet a predetermined requirement. The one-way-hash function is embedded as part of the BIST circuit in the integrated circuit or implemented within automated test equipment.
    Type: Application
    Filed: November 17, 2003
    Publication date: December 23, 2004
    Inventor: Yen-Fu Liu
  • Patent number: D578248
    Type: Grant
    Filed: December 14, 2007
    Date of Patent: October 7, 2008
    Assignee: Ledtech Electronics Corp.
    Inventors: Hung-Hsin Lee, Yen-Fu Liu
  • Patent number: D583496
    Type: Grant
    Filed: March 28, 2007
    Date of Patent: December 23, 2008
    Assignee: Ledtech Electronics Corp.
    Inventors: Shu Shoung Kuo, Yen Fu Liu, Yu Yang Liu