Improved liner and improved shaped charge especially for use in a well pipe perforating gun
CA 2209638 C · Owner: Renfro, Steven L. · Inventors: Renfro, Steven L.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A liner (30) for a shaped charge, (10) has a hemispherical apex and a skirt portion (38) which terminates in a circular skirt edge (40) having a skirt edge diameter (D). The apex (36) has, a radius of curvature which is less than the skirt edge diameter (D) and the, thickness (Tac) of the liner at the center of the apex (36) is greater than the thickness (Ts) of the liner at the skirt edge (40), with the thickness tapering between the apex and the skirt edge in a smooth, curvilinear transition. The, liner (30) may be employed in a shaped charge (10) which includes a shaped, explosive (26) which has been compressed to at least 95 % of its theoretical maximum density and is contained, 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 January 16, 1996 and granted August 8, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 16, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 16, 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.