Propelling pencil
CA 1201997 A · Owner: Kotobuki & Co. Ltd. · Inventors: Kageyama, Hidehei
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A knock-type propelling pencil comprising a lead pipe inserted into an outer cylinder and having a lead chuck at the end portion thereof, a chuck-fastening tube for fastening the lead chuck, a cushion sleeve coming into contact with said chuck-fastening tube being slidable relative to said outer cylinder, and being urged by a spring wherein, said cushion sleeve has a cushion portion which can be resiliently deformed to absorb excessive writing pressure and thereby preventing breaking of the lead.
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 March 18, 1986. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 18, 2003.
- 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.