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Expired Canadian patentCanada

Explosion-proof electrical generator system

CA 1269693 C · Owner: Elris, Viggo · Inventors: Johnson, Roderick Michael; Elris, Viggo; Hamilton, Robert Ross

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

An explosion-proof electrical generator includes generally toroidal casing with one open end and a central circular end wall 01 plate or cylindrical fan containing cup extending across and closing the center of the coils; a circular cover closing the open end of the casing a stator defined by laminated plates and windings located in the annular recess of the casing; and a rotor mounted in the cover and including a shaft and a bowl-shaped cup, carrying a ring of permanent magnets in its side wall which extends, into the casing recess between the stator and the outer side wall of the casing. Cooling finds are provided on the casing and cover for dissipating heat produced in the generator. The …

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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 May 29, 1990. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 29, 2007.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledMay 13, 1987
GrantedMay 29, 1990
Term endedMay 29, 2007
Patent numberCA 1269693 C
Classification (IPC)H02K5/13 +1 more

Timeline

Timeline From CIPO dates

1988199019921994199619982000200220042006Application filedMay 13, 1987Patent grantedMay 29, 1990Term endedMay 29, 2007

Sources & verification

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