Double piston propulsion unit
CA 2092804 C · Owner: Qinetiq Limited · Inventors: Clark, Robert Owen
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A double piston propulsion unit for a recoilless mass/countermass projectile launcher comprises two hollow cylindrical pistons (22, 23) arranged in a back-to-back relationship with closed outer ends and open inner ends, the open inner ends being joined together by a circumferential rupturable connecting means so that the pistons form a vessel in which a propellant charge (34) is enclosed. In operation, the unit is slideably located inside the openende launch tube (1) of the projectile launcher at its mid-point. The propellant when initiated causes a build up of propellant gases inside the vessel and when the gas pressure reaches a pre-determined value the connecting means fails in …
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 September 26, 1991 and granted May 1, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended September 26, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 26, 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.