Expired Canadian patentCanada
High humidity resistant electrical grade polymer concrete
CA 1093809 A · Owner: Gould Inc. · Inventors: Reighter, David H.
Overview
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Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
Canada, C-1868(ER/MRD), HIGH HUMIDITY RESISTANT ELECTRICAL GRADE POLYMER CONCRETE, ABSTRACT OF THE DISCLOSURE Moisture absorption by polymer concrete under high humidity conditions is greatly reduced by treating the concrete aggregate with a silane.
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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 January 20, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended January 20, 1998.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 5, 1978
GrantedJanuary 20, 1981
Term endedJanuary 20, 1998
Patent numberCA 1093809 A
Classification (IPC)H01B3/30 +2 more
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.