Radar apparatus with jamming indicator and receiver device with jamming indicator
CA 2044044 C · Owner: Hollandse Signaalapparaten B.V. · Inventors: Dijkstra, Jan Albert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The invention relates to a radar apparatus having a wideband preselector filter (15), a wideband preamplifier (16) a, narrowband IF filter (19) and a jamming indicator (11). In order to obtain a warning against a jammer being active within the large bandwidth of the preselector filter (15) but outside the narrowband IF filter (19), the jammer indicator (11) has the same bandwidth as the wideband preselector filter and is connected after the preamplifier (16), but before the narrowband IF filter (19). A warning is necessary as a jammer of this type may greatly reduce the sensitivity of the radar apparatus by saturating the preamplifier (16).
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 June 6, 1991 and granted April 28, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 6, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 6, 2013.
- 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.