Positive seal coupling internal joining press
CA 2090671 A1 · Owner: Freed, David I. · Inventors: Fisk, Allan T.; Freed, David I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention is a new apparatus for installing press fit couplings about steel pipeline sections. Conventional apparatuses are extremely large, usually requiring extensive mounting equipment and are incapable of being used in the confined spaces of a pipe trench. This invention solves the problem with a small compact, pipe coupling apparatus which is easily maneuvrable in tight spaces. The apparatus (10) fits within two pipes (1 2) to be joined, with a coupling (3) disposed between them. Two hydraulically actuated grippers (6, 7) grip the insides of both pipes (1 2), respectively, and a hydraulically actuated cylinder (5) is operated to pull the pipes (1, 2) together, press fitting 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 September 18, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended September 18, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by September 18, 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.
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.