Environmentally improved shot
CA 2095232 C · Owner: Huffman, John · Inventors: Huffman, John; Shannon, John
Overview
Its claims, description and drawings are in the Canadian Patents Database.
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Abstract From the Canadian patent
Environmentally improved alternatives to lead shot are provided that overcoat a lead core with a chemically inert polymer bonded thereto by heating lead shot coated with the polymer above the melting point of the lead shot, or by substituting for lead a combination of dense metal and light metal and either a core/coating , bimetallic sphere relationship or a matrix of light metal provided with powder of a heavy metal embedded therein. The composite shot exhibits a density similar to that of lead.
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 October 30, 1991 and granted January 25, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 30, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 30, 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.