Nail with differential holding capabilities along its shank
CA 2023865 C · Owner: Illinois Tool Works Inc. · Inventors: Schniedermeier, Henry W.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A nail designed to be initially driven through a first board, and into a second board so as to assemble the boards with the boards engaging each other and to, be subsequently pulled, as by a crowbar or a claw on a hammer head, so as to disassemble the boards. The nail has a head and a shank with a pointed end. A relatively smooth portion of the shank extends axially from the pointed end for a substantial distance. A relatively rough portion, which is formed with annular frustoconical rings defining annular grooves extends, axially from between the relatively smooth portion toward the head for a distance equal approximately to the thickness of the first board. A relatively smooth portion …
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 August 23, 1990 and granted April 21, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended August 23, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by August 23, 2012.
- 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.