Canadian application, no grantCanada
Screw thread structure
CA 2042879 A1 · Owner: Mildren, David · Inventors: Ham, Joel; Yousef, Faisal J.; Mildren, David
Overview
Drawings and full text
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A screw thread structure includes a root portion the shape of which is defined by portions of two axially overlapping ellipses interconnected by a flat.
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 May 17, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 17, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 17, 2013.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 17, 1991
GrantedNo grant recorded
Term endedMay 17, 2011
Patent numberCA 2042879 A1
Classification (IPC)F16B23/00 +2 more
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.