Process for applying a thin film containing low levels of a functional-polysiloxane and a nonfunctional-polysiloxane to tissue paper
CA 2185108 C · Owner: Ampulski, Robert Stanley · Inventors: Ampulski, Robert Stanley
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Disclosed is a process for making soft tissue paper which includes providing a dry tissue web and then applying a sufficient amount of a functional-polysiloxane softener compound to the dry web. The softener application process includes the steps of mixing a functionalpolysiloxane compound with a suitable nonvolatile diluent such as a nonfunctional-polysiloxane, forming an emulsion containing the functional-polysiloxane compound and nonvolatile diluent using a volatile solvent such as water, and surfactant emulsifier applying the, emulsion to a heated transfer surface evaporating the volatile solvent from the emulsion to form a film and then contacting the dry tissue, web with the heated …
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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 January 23, 1995 and granted July 30, 2002. A Canadian patent filed from October 1, 1989 lasts 20 years from filing, so its term ended January 23, 2015.
- A certificate of supplementary protection adds at most two years for a drug, so even that would have ended by January 23, 2017.
- 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.