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Expired Canadian patentCanada

Hybrid hydrostatic pneumatic power generation system

CA 1134713 A · Owner: Cassidy, Joseph C. · Inventors: Cassidy, Joseph C.

CIPO record

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Its claims, description and drawings are in the Canadian Patents Database.

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Abstract From the Canadian patent

Abstract of the Invention, The apparatus of the present invention is comprised of transfer tanks which are located below the hydraulic head of a dam. Connected to the transfer tanks are air inlets extending from the transfer tanks to the atmosphere and, having check valves located therein. A water inlet and motor operated valve, interconnect the transfer tanks with the fluid behind the dam, and a water outlet and motor operated valve empty the transfer tank downstream of the dam. Associated with the transfer tanks is a storage tank which is interconnected to the transfer tanks by transfer lines having check valves at their transfer tank ends and a turbine out-, let extends from the storage …

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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 November 2, 1982. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 2, 1999.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledDecember 7, 1979
GrantedNovember 2, 1982
Term endedNovember 2, 1999
Patent numberCA 1134713 A
Classification (IPC)F15B11/06

Timeline

Timeline From CIPO dates

1980198219841986198819901992199419961998Application filedDec 7, 1979Patent grantedNov 2, 1982Term endedNov 2, 1999

Sources & verification

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