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Expired Canadian patentCanada

Doubly-truncated circular waveguide

CA 1263155 C · Owner: Sola Basic Industries, Inc. · Inventors: Ben-Dov, Oded

CIPO record

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Abstract From the Canadian patent

of the Invention, A method for fabricating a waveguide having reduced windloading yet a relatively wide bandwidth for the dominant mode of propagation which comprises an elongated cylinder having substantially parallel plates forming an interior waveguide portion which in cross-section is a doubly-truncated circle. The plates are symmetrically disposed about the central axis of the elongated cylinder.

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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 21, 1989. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended November 21, 2006.
  • 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 26, 1986
GrantedNovember 21, 1989
Term endedNovember 21, 2006
Patent numberCA 1263155 C
Classification (IPC)H01P11/00

Timeline

Timeline From CIPO dates

1987198919911993199519971999200120032005Application filedMay 26, 1986Patent grantedNov 21, 1989Term endedNov 21, 2006

Sources & verification

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