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Expired Canadian patentCanada

Pretreatment of solid wastes, and wastes to be compacted, for introduction into underground salt cavities or salt caverns via a downpipeunder the force of gravity

CA 1280901 C · Owner: Wartenpfuhl, Friedel · Inventors: Jahn-Held, Wilhelm; Lindoerfer, Walter; Wartenpfuhl, Friedel

CIPO record

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Abstract From the Canadian patent

Solid wastes and wastes to, be compacted, are pretreated for introduction into underground salt cavities or salt caverns via a downpipe under the force of gravity by a process in which solid uncom-, minuted or comminuted or finely divided to very finely divided wastes are mixed with waste sludges in a ratio such that a material results from which moldings are produced, with or without the addition of a binder in the, form of granules, agglomerates or pellets by a granulation method, or in the form of flakes by a pressing method, the flakes being comminuted to give small moldings, and, if appropriate, the moldings are surface-dried or dried completely the moldings which are free-flowing …

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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

  • Granted March 5, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended March 5, 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.
FiledJanuary 15, 1987
GrantedMarch 5, 1991
Term endedMarch 5, 2008
Patent numberCA 1280901 C
Classification (IPC)B09B1/00 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJan 15, 1987Patent grantedMarch 5, 1991Term endedMarch 5, 2008

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Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.