Multi-level sectorized cdma communications
CA 2227468 C · Owner: Lynch, Michael A. · Inventors: Lynch, Michael A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A base station of a code division multiple access (CDMA)-based communications network (e.g. one conforming to the IS-95 standard) is sectorized such that a first subset of CDMA channels are communicated using a first level of cell-site sectorization and a second subset of CDMA channels, different from the first subset are, communicated using a second level of cell-site sectorization, different from the first level. For example, the first set of CDMA channels may be the pilot and sync channels and the second subset of CDMA channels may be the access, paging, and traffic channels. In one set of implementations, at the first sectorization level each cell site is omnidirectional (for the first …
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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 January 20, 1998 and granted October 30, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 20, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 20, 2020.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.