Thawing tube guide for a culvert
CA 2230541 C · Owner: Sagar, Robert · Inventors: Sagar, Robert
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A thawing tube guide is prepositioned at the opening of a culvert to facilitate maintenance personnel in passing a culvert thawing tube with a power head into a culvert opening which is covered by ice snow or an ice slurry. The culvert thawing tube guide includes a guide pipe having a discharge end positioned within the culvert and an inlet end positioned in at an easily accessible location. A cap and a reflective material are attached to the inlet end to prevent the accumulation of debris within the tube and to aid in detecting its location respectively.
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 February 26, 1998 and granted August 7, 2001. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2018.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.