Segmented pipe couplings employing t-bolts and improved t-bolts therefor
CA 2247760 A1 · Owner: Mason, Dennis A. · Inventors: Mason, Dennis A.; Stone, Jon T.; Dole, Douglas R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A segmented pipe coupling includes traction bolts that permit movement of shanks of the traction bolts into an attitude in which the head and nut of the traction bolts engage their respective bolting faces in continuous, engagement, thus to eliminate a drop in tensile stress in a shank of the traction, bolt due to shifting of the head of the bolt or the nut subsequent to initial torquing down of the nut.
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 18, 1998. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 18, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 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.