Well tools
CA 2105415 A1 · Owner: Sable, Donald E. · Inventors: Sable, Donald E.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A sucker rod assembly having migratory scrapers movable over the full length of the sucker rod shanks between the upsets or opposite ends of the shank and fixed scrapers of the rod. Fixed scrapers having end portions to protect the rod against wear and abrasion above and below each fixed scraper body on migratory scrapers having internal stop surfaces engageable with one of the same configurations as the flared surfaces of the rod upsets.
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 September 2, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 2, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 2, 2015.
- 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.