Roll angle determination
CA 2040685 C · Owner: Ab Bofors · Inventors: Hansen, Ake
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
The invention relates to an arrangement for determining the roll angle position of a rotating projectile shell, missile, or the like with the aid of polarised electromagnetic radiation comprising a transmitter arranged to emit a position-determining polarised radiation in the direction towards the projectile and a receiver arranged in the projectile in order to receive the transmitted radiation. The emitted radiation consists of two components, on the one hand a component in the long-wave band and on the other hand a component in the microwave band. The microwave component comprises a pulse train in which the pulses are intended to indicate whey the long-wave component is situated in a …
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.
Why it's free to use
- Filed April 17, 1991 and granted April 16, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended April 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 17, 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.