Valve for ink-jet pen
CA 2060600 A1 · Owner: Mcclelland, Paul H. · Inventors: Winslow, Thomas H.; Wenzel, Donald E.; Mcclelland, Paul H.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ink-jet pen (22) for storing at below-ambient pressure has an orifice (54) formed therein for providing air bubbles to prevent the back pressure from rising above a level that would cause malfunction of the pen (22). The amount of air drawn into the reservoir (24) is restricted by the reservoir ink (31) that covers the orifice (54) whenever the pen (22) is in an upright position. The valve (20) operates to occlude the orifice (54) whenever the pen (22) is moved into a position, such as inverted where the reservoir ink no longer covers the orifice (54). The occlusion of the orifice prevents the unrestricted flow of ambient air into the reservoir (24) that would otherwise eliminate the …
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 February 4, 1992. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended February 4, 2012.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by February 4, 2014.
- 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.