Trailer mounted power swivel
CA 2206675 C · Owner: Wessel, Warren · Inventors: Wessel, Warren
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A trailer mounted power swivel includes in combination, a trailer and a power swivel unit. The trailer is elongate and has ground engaging wheels supporting a cargo deck. The cargo deck is divided lengthwise into a first section and a second section. The power swivel unit is secured solely to the first section, thereby causing a load imbalance which renders the trailer unstable for highway travel. This imbalance can be remedied by placing the second section of the cargo deck under load. The second section of the cargo deck is adapted to carry a sufficient number of drill collars to counterbalance the weight of the power swivel unit until the stability of the trailer is restored.
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 May 29, 1997 and granted March 21, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended May 29, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 29, 2019.
- 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.