Renewable cap attached to a writing instrument
CA 2000125 A1 · Owner: Isoda, Takashi · Inventors: Isoda, Takashi
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A removable cap attached to a writing instrument in an insertion manner for preventing ink from evaporating from the writing instrument, comprises: a groove formed in an outer peripheral surface of the cap to substantially axially extend over the full axial length of the outer peripheral surface of the cap, whereby the groove of the cap enables an infant to inhale and exhale air even when the infant's bronchi are clogged with the cap.
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 October 4, 1989. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended October 4, 2009.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 4, 2011.
- 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.