Gypsum wallboard paper having imitation manila colored coating
CA 1296608 C · Owner: Long, William J. · Inventors: Long, William J.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A paper cover sheet particularly designed for use as the face sheet in the manufacture of gypsum wallboard the face sheet having a base, formed of a plurality of of filler plies formed of recycled paper comprised of clean hard stocks such as kraft and boxboard cuttings and, being free of topliner plies containing flyleaf furnish the base, having a coating on the face surface thereof comprising a light colored mineral filler and a binder. The coating provides a light color to the face surface generally termed "manila". The elimination of the topliner plies results in a paper of exellent strength and porosity.
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
- Granted March 3, 1992. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 3, 2009.
- 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.