Method of forming a screw thread and tubular body with a screw thread
CA 1333652 C · Owner: Gruber, Heinz · Inventors: Gruber, Heinz
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The present invention is directed to a method for forming a screw-thread and a tubular body with a screw thread. The conventional manufacture of an internal thread on a connecting sleeve, which is used as the coupling element for parts of a rock anchor or drilling rod by shaping, involving, cutting, in particular by thread cutting is characterised, by a very large consumption of energy since considerable, cutting work is involved with a rounded thread. Furthermore in the preparation by cutting of a screw-thread in this instance of use, it is a disadvantage that because of the notching effect, in the basic region of the threaded section the durability of the connecting sleeve is adversely …
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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 December 27, 1994. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended December 27, 2011.
- 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.