Spacer screw
CA 2254745 A1 · Owner: Hofer, David · Inventors: Hofer, David
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The spacer screw has a thread section which can be inserted into a base member, a head section which can be introduced into a structural member and has a thread and a shank section arranged in between. According to the invention, the thread is provided with a series of slits which in turn is formed from recesses running transversely to the screw axis and interrupting the thread turn at constant distances. When the screw is used, the thread is screwed into the structural member which, in contrast to the use of known screws is, effected without excessive force. In addition this, screwing-in process takes place independently of the screwing of the thread section into the base member. When the …
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 November 19, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended November 19, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by November 19, 2020.
- 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.