Writing instrument
CA 2181043 C · Owner: Parker Pen Products · Inventors: Wacha, Martin E.; Pennel, Evan K.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A writing instrument (10) with an advance-retract mechanism is operable by rotation of a knob (46) opposite the writing tip. The knob rotates a shaft (16) disposed in, and extending rearwardly from the instrument body to advance and retract the writing tip when rotated. A retainer member (28) has a first cylindrical portion (32) with a plurality of inwardly extending tangs (33) into which the shaft is received and a larger cylindrical portion (34) having a surface (36) directed toward the instrument body.
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 January 26, 1995 and granted May 25, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 26, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 26, 2017.
- 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.