Heating element defrosting assembly/process
CA 2133908 A1 · Owner: Di Staulo, Michael · Inventors: Vaccher, John; Di Staulo, Michael
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A tool for defrosting the frozen earth for the purpose of trench excavation, bulk excavation or any excavation projects for use during winter or frozen conditions. It consists of a cable with a series of heating elements connected in parallel the elements, may be removable and the spacing between the elements may be made to vary depending on specific site conditions. This tool contains no mechanical parts subject to wear or breakage and can be left unsupervised to obtain a prepared work site for the next day. Once initially set-up it can be left unsupervised eliminating paid man-hours used in traditional methods.
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 October 20, 1994. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 20, 2014.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 20, 2016.
- 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.