Expired Canadian patentCanada
Blasting method
CA 278809 A · Owner: Dent Ferrell · Inventors: John H. Crawford; Dent Ferrell; Arthur W. Helmholtz
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordNo Claude kit for weapons
Claude doesn't help design weapons, ammunition or explosives, so this page has no Reinvent kit. To develop this one, work with a federally licensed manufacturer (many of these items are regulated) and a registered patent attorney or agent, listed on the USPTO roster.
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
- Granted March 27, 1928. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 27, 1945.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Filed—
GrantedMarch 27, 1928
Term endedMarch 27, 1945
Patent numberCA 278809 A
Classification (IPC)F42D1/00
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.