Circular shaped charge
CA 2429932 C · Owner: Halliburton Energy Services, Inc. · Inventors: Grattan, Tony F.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
A circular shaped charge and methods of manufacture shipping and assembly. An circular shaped charge is manufactured as two separate charge halves upper and lower, and a separate continuous liner or pair of continuous half liners. Preferably each charge half is formed of a number of segments each comprising a reduced weight of explosive which can be shipped under preferred regulations. The explosive contains sufficient binder to prevent damage to the charge segments during shipping and assembly at a job site. The separately shipped components are assembled at the job site to form a complete circular shaped charge useful for example, in a tubing cutter.
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 May 27, 2003 and granted April 12, 2011. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 27, 2023.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 27, 2025.
- 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.