Long-pitch re-rolled crest thread
CA 1105298 A · Owner: Gutshall, Charles E. · Inventors: Gutshall, Charles E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A threaded fastener incorporates a long-pitch helical thread rolled on a cylindrical blank of predetermined diameter, leaving untouched a section of the blank between adjacent turns or convolutions of the thread. The thread has a crest which is greater in daimeter than the blank and a root which is smaller in diameter than the blank. The contour of the thread in a plane including the longitudinal axis of the screw is unsymmetrical about a line perpendicular to the axis and passing through the crest the flank of the, crest facing the head end of the screw being more nearly perpendicular to the axis than the flank facing the workentering end of the screw. At each juncture between the root of …
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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 July 21, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 21, 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.