Liquid electrophotographic development system
CA 2054652 C · Owner: Feather, David H. · Inventors: Guy, Jon S.; Feather, David H.; Maiefski, Romaine R.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A liquid electrophotographic development system has a plurality of removable cartridges (11) mounted on a rotatable support for selective engagement with an electrophotographic member (13) to be developed. Each cartridge (11) has a liquid developer reservoir (29) and a flexible toner concentrate container (26) from which concentrate is supplied to the developer in the reservoir as needed. A fluted roll (30) pumps developer in a uniform manner from the reservoir (29) to the electrophotographic member (13). After depletion of the toner concentrate and developer any developer, remaining in the cartridge (11) can be pumped into the flexible container (26) to prevent spillage on disposal of 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 October 31, 1991 and granted May 18, 1999. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended October 31, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by October 31, 2013.
- 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.