Blank for the manufacture of extruding and tapping screw
CA 1110475 A · Owner: Illinois Tool Works Inc. · Inventors: Sygnator, Henry A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a screw blank used in the formation of an extruding and thread-forming screw fastener which includes a shank with an enlarged head at one extremity The shank, is comprised of a substantially cylindrical upper portion of a predetermined diameter adjacent the head of the blank and a lead portion formed at the extremity opposite the head. The largest diameter of the lead portion is less than the predetermined diameter of the upper shank portion and an, intermediate, transition shank portion between the lead and the upper shank portions includes a pair of dissimilar partially frustoconical tapering regions forming two opposing peripheral segments of the transition portion located …
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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
- Granted October 13, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended October 13, 1998.
- 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.