Dual mode amplifier network for radiotelephone
CA 2120679 C · Owner: Motorola, Inc. · Inventors: Schwent, Dale G.; Yochem, Donald M.; Colvis, Christopher O.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The dual mode amplifier network for radiotelephone of the present invention has a first path (110) to be used in the U.S. Digital Cellular mode, and a second path (120) to be used in the FM analog cellular mode. The first path (110) has a first switch (106) coupled to the network input and to an isolator (103). A second switch (107) couples the isolator (103) to the network output. A third switch (108), in the second path (120) couples the, network input to a filter (104). A fourth switch (109) couples to the filter (104) to the network output. A controller (130) closes the first switch (106) and the second switch (107) and opens the third switch (108) and the fourth switch (109) in 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 April 6, 1994 and granted September 22, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 6, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 6, 2016.
- 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.