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Expired Canadian patentCanada

System and method to enable wusb applications in a distributed uwb mac

CA 2558531 C · Owner: Nandagopalan, Sai Shankar · Inventors: Del Prado Pavon, Javier; Challapali, Kiran; Nandagopalan, Sai Shankar

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Abstract From the Canadian patent

A system and method is provided for incorporating host-device communication in wireless IJSB (WUSB). A host (101) either uses a multicast Distributed Reservation Protocol (DRP) frame on behalf of connected devices (102) to reserve wireless channel resources, a unicast DRP frame or Enhanced Distributed Channel Access (EDCA) with a Poll Frame. In the case of a unicast DRP frame the number of unicast frames sent for reservation depends on the number of connected devices (102).

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Listed from its CIPO record in Patent Yard's archive of Canadian patents past their term. Its claims, description and drawings are in the CIPO record and on Google Patents, and the Claude kit works from them.

Why it's free to use

  • Filed March 4, 2005 and granted June 17, 2014. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 4, 2025.
  • Certificates of supplementary protection extend only drug patents, and it isn't classified as one.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMarch 4, 2005
GrantedJune 17, 2014
Term endedMarch 4, 2025
Patent numberCA 2558531 C
Classification (IPC)H04W84/20

Timeline

Timeline From CIPO dates

2006200820102012201420162018202020222024Application filedMarch 4, 2005Patent grantedJune 17, 2014Term endedMarch 4, 2025

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.