Method for manufacturing nails
CA 2042811 C · Owner: Shelton, Lawrence S. · Inventors: Heminger, David; Lat, Geronimo E.; Shelton, Lawrence S.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Nails suitable for outdoor use, such as roofing nails, are formed from carbon steel wire pre-coated with a metallic layer, which has corrosion-resistant properties, such as a zinc layer applied by pre-galvanizing the wire. Each nail is formed with a shank and with a head. The metallic layer is discontinuous in a region on the head of each nail. The nails are collated by means of collating wires welded to the shanks of the nails. The collated nails are coiled. The coiled nails are cleaned in a cleaning bath such as, 1,1,trichloroethane. The cleaned nails are coated with a polymeric layer, which covers the region on the head of each nail where the metallic layer is discontinuous thus …
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, and the Claude kit works from them.
Why it's free to use
- Filed May 17, 1991 and granted February 3, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 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.