Mains bursting tool
CA 1237118 A · Owner: British Gas Corporation · Inventors: Wayman, Malcolm; Mood, Geoffrey I.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The tool has a hollow elongated body 10 made up of a leading section 12 attachable to a tow-cable by 8 clevis 28 an intermediate section 14 and, a trailing section 16 housing a hydraulic cylinder 24 and attachable to a main liner 30. The intermediate section includes a frusto-conical wall in two parts 16 and 18, each of 180° angular extent. The ram 24 operates a wedge 22 longitudinally to move the first part 16 outwardly or inwardly transversely of the body. The parts 16 18 are slidably trapped to the wedge by slide components projecting into grooves. The tool is pulled by the tow cable into the main with the part 16 retracted. Then the part 16 is moved outwardly to burst and enlarge 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
- Granted May 24, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 24, 2005.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
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.