Patents by Inventor Tissa R. Karunasiri

Tissa R. Karunasiri 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: 6184656
    Abstract: A radio frequency energy management system includes a number of battery control modules and/or a control unit that are configured to exchange battery operating parameter/performance information and control signals by radio frequency. Each battery control module includes one or more sensing elements to measure one or more operating parameter of a respective battery, and at least one device selected from the group including a radio frequency receiver, a radio frequency transmitter, a memory device, a controller, control devices, a signal blocking device, and combinations thereof. The control unit is configured to monitor and control the operating parameters of the batteries and includes a radio frequency receiver and a radio frequency transmitter.
    Type: Grant
    Filed: July 15, 1999
    Date of Patent: February 6, 2001
    Assignee: Aevt, Inc.
    Inventors: Tissa R. Karunasiri, David A. Bell, Chetan Kumar Maini, Bruce M. Ryan
  • Patent number: 6064422
    Abstract: A communication system is provided which allows video and audio/video transmissions over unloaded, twisted pairs of telephone wires. The system provides for automatic compensation of attenuation of a broadband video signal by measuring the attenuation of the low frequency components of the signal to determine the length of the unloaded, twisted pair through which the signal has been transmitted. This calculation is performed by comparing the attunated signal with the known signal level of transmission. Based upon the calculated length, the signal is amplified nonlinearly, since a greater loss occurs in the high frequency portions of a broadband signal than in the low frequency portions in transmission over twisted pairs of telephone wires. The signal is thereupon reconstructed. Also, the system allows transmission of a broadband frequency spectrum much wider than has heretofore been obtained. A broadband signal of at least 10.7 MHz can be transmitted over the system.
    Type: Grant
    Filed: April 21, 1997
    Date of Patent: May 16, 2000
    Assignee: The Goolcharan Charitable Trust
    Inventors: Boysie Goolcharan, Tissa R. Karunasiri
  • Patent number: 5703464
    Abstract: A radio frequency energy management system includes a number of battery control modules and an control unit, each configured to transmit and receive radio frequency signals comprising information relating to the operating parameters of batteries in a battery pack, and control commands for regulating the operating parameters of such batteries. Each battery control module is configured to monitor one or more operating parameter of a respective battery, and to regulate one or more operating parameter according to a control system program in the control unit. Each battery control module includes one or more sensing elements to measure one or more operating parameter of a respective battery, a radio frequency receiver, and a radio frequency transmitter.
    Type: Grant
    Filed: June 28, 1995
    Date of Patent: December 30, 1997
    Assignee: Amerigon, Inc.
    Inventors: Tissa R. Karunasiri, David A. Bell, Bruce M. Ryan
  • Patent number: 5626021
    Abstract: A temperature climate control system comprises a variable temperature seat, at least one heat pump, at least one heat pump temperature sensor, and a controller. Each heat pump comprises a number of Peltier thermoelectric modules for temperature conditioning the air in a main heat exchanger and a main exchanger fan for passing the conditioned air from the main exchanger to the variable temperature seat. The Peltier modules and each main fan may be manually adjusted via a control switch or a control signal. Additionally, the temperature climate control system may comprise a number of additional temperature sensors to monitor the temperature of the ambient air surrounding the occupant as well as the temperature of the conditioned air directed to the occupant.
    Type: Grant
    Filed: August 10, 1994
    Date of Patent: May 6, 1997
    Assignee: Amerigon, Inc.
    Inventors: Tissa R. Karunasiri, David F. Gallup, David R. Noles, Christian T. Gregory