An improved periodic wireless data broadcast
CA 2219283 C · Owner: Bell Communications Research, Inc. · Inventors: Jain, Ravi Kumar; Werth, John St. Clair Jr.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An airdisk (80) performs a TDMA/FDMA (Time Division Multiple Access/Frequency Division Multiple Access) wireless broadcast divided into periodically-, repeated time-slotted data items analogous to sectors on a rotating disk over multiple broadcast frequencies, analogous to tracks on a disk. The data items (1-14) on the airdisk may be sorted according to user interest user , profile, or from polling user preferences as by the monitoring of an uplink for user requests. The monitoring of the uplink can be performed in a time less than the rotation period of the airdisk. Users may be precluded from requesting data already on the airdisk for a prescribed time period. The sorting of the …
Read the whole patent
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 1, 1996 and granted October 12, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended March 1, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by March 1, 2018.
- 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.