Method and apparatus for reclaiming gypsum from waste wallboard
CA 1284290 C · Owner: Macleod, Bruce Colin · Inventors: Burley, Keith Alexander; Macleod, Bruce Colin
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
This invention pertains to a method and apparatus for reclaiming gypsum from waste gypsum wallboard. The invention is directed to an apparatus that is useful for separating paper laminate from gypsum wallboard comprising: a) a first roller means; b) a second means spatially disposed from the first roller means. The first and/or second means can be driven together or independently from the same or a separate power source.
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 May 21, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 21, 2008.
- 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.