Oval door knob construction
CA 2198581 C · Owner: Ellis, Philip C. · Inventors: Ellis, Philip C.; Meck, Leslie A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A door knob construction featuring a knob and cover to incorporate decorative detail. The knob construction consists of an oval knob body, a shank fastened to the knob body and a cover which fits over the shank to complete the decorative knob assembly. The knob body is hollow to accommodate the lock cylinder and includes a small diameter hole through which the cylinder protrudes. The knob body is secured to the knob shank by fasteners. The shank includes longitudinal ridges to form an interference fit with the decorative shank cover.
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, 1997 and granted August 24, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended February 26, 2017.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 26, 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.