Pipe burster
CA 2018610 C · Owner: Bg Plc · Inventors: Carruthers, Alec Reginald
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A pipe burster for cracking gas and other pipes preparatory to inserting a replacement pipe in the passage so formed. The burster comprises an elongated body tapering in the lengthwise direction and made up of first and second parts (12,14) extending in said direction. The parts are connected by a transverse pivot pin (20). The first part (12) is received within the second part and carries a piston and cylinder(22)by which the parts are separable. The circumference of the body is substantially a closed curve and within the length of the first part the circumference is increased by said separation. Therefore the burster makes a clearance by said separation into which the burster can be …
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 June 8, 1990 and granted June 2, 1998. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 8, 2010.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 8, 2012.
- 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.