Sheet metal screw
CA 1099962 A · Owner: Leviton Manufacturing Co. Inc. · Inventors: Poliak, John N.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sheet metal mounting screw and method of forming the same is disclosed. The screw is formed from a single flat blank of sheet metal having a generally T-shaped head and a slotted shank or barrel. The shank, when folded is tubular, and has a seam extending along one side with spaced resilient, teeth extending outwardly from opposite sides thereof. The teeth have inclined outer edges arranged in a helical path extending lengthwise around the shank in staggered relation to one other, for engagement with either tapped or untapped openings in a support. The teeth are resilient and permit a push-in insertion of the threaded shank in the helically threaded opening. The T-shaped head is formed …
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
- Granted April 28, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended April 28, 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.