Retrofit lever assembly for a door knob
CA 1238457 A · Owner: Schlage Lock Company · Inventors: Bettger, Richard R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
The lever assembly is of two principal parts a, lever with a circular aperture to engage the shank of a door knob, and a retaining plate, for fastening thereof to the lever, having a projecting cog. The cog engages a knob catch slot in the door knob shank. Accordingly as the, lever is rotated/manipulated, it turns the door knob through the engagement of the cog with the slot and the fastening, of the plate to the lever. The assembly accommodates retrofitting thereof to doors having round door knobs.
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
- Granted June 28, 1988. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 28, 2005.
- 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.