Mechanical pencil
CA 1255629 A · Owner: Kotobuki & Co. Ltd. · Inventors: Kageyama, Hidehei; Kuwabara, Yukimasa
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A mechanical pencil wherein a slider in contact with a lead and an outer tube with different frictional resistances other than a lead delivery mechanism for effecting lead-free by general knocking operation are provided within the outer tube or a fore means, whereby the end of a consumed lead is pressed against or released from a surface of paper or the like to thereby project the lead from a lead guide by an amount corresponding to backward movement of the slider. The lead-feeding may be easily accomplished merely by pressing operation without changing the grip of the outer tube.
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 13, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 13, 2006.
- 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.