Ink pressure regulator for a thermal ink jet printer
CA 2093971 A1 · Owner: Hewlett-Packard Company · Inventors: Kaplinsky, George T.; Khodapanah, Tofigh
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
An ink pressure regulator for use inside of a flexible ink bag reservoir for a replaceable or refillable ink cartridge comprises a bow spring (60) configured to have substantially linear force/deflection characteristics and a pair of plates (40 50) which collapse to a substantially flat shape to minimize the amount of ink remaining after printing has depleted the ink from the cartridge. The regulator may be manufactured of one or a plurality of separate pieces.
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 April 14, 1993. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended April 14, 2013.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by April 14, 2015.
- 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.