Heavy duty double-ball pinless caster, and method of manufacture thereof
CA 2179802 C · Owner: Shouldice, William Ross · Inventors: Shouldice, William Ross
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A method of manufacturing a pinless caster comprising the steps of: 1. selecting the appropriate material capable of being manufactured to a predetermined resistance to wear and fatigue 2. forming a first part from said selected materials 3. forming a first one-half load carrying raceway extending in substantially a first plane within the first part 4. forming a second one-half swivel bearing raceway extending in substantially a second plane disposed at substantially 90 degrees to the first plane within the first part, 5. forming a second part from the selected materials so as to allow interfitting of the second part with the first part when assembled, 6. forming a third one-half …
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 24, 1996 and granted September 12, 2000. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended June 24, 2016.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by June 24, 2018.
- 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.