Mineral acids as charge adjuvants for positive liquid electrostatic developers
CA 2042095 A1 · Owner: Dximaging · Inventors: Trout, Torence J.; Houle, William A.; Pearlstine, Kathryn A.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A positive charged electrostatic liquid developer consisting essentially of, (A) a non-polar liquid having a Kauri-butanol value of less than 30, (B) thermoplastic resin particles average by area, particle size of less than 10 µm (C) a charge director compound, and, (D) at least one inorganic acid having a solubility of at least 0.5% based on the weight of charge director compound in a mixture of (A) and (C) and represented by the formula:, HxY, wherein x is an integer from 1-4 and is equal to the negative charge on the anion, Y is a moiety selected from the group consisting of Cl-, F-, NO3-, NO2-, PO4-3, SO4-2, SO3-2 ClO4-, and, IO4-. The liquid developer is useful in copying color, …
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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 May 8, 1991. No grant is recorded for it in Canada; had it been granted, its 20-year term would have ended May 8, 2011.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by May 8, 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.