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Expired Canadian patentCanada

Method for detecting dripping droplet

CA 1284875 C · Owner: Japan Nuclear Cycle Development Institute · Inventors: Hayashi, Ken-Ichi

CIPO record

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Abstract From the Canadian patent

A method for detecting a dripping transparent droplet which can preferably be applied to remotely and successively detect the leak of a liquid in a place inaccessible by a person. The method comprises subjecting parallel rays of light to enter the dripping droplet to generate light scattered from the droplet at a predetermined scattering angle, the scattered light being composed of light reflected by the surface of the droplet and light transmitted and refracted in the droplet and then emitted from the surface thereof; imaging the scattered light on a one-dimensional photosensor by an optical imaging system to form in the image two luminescent spots resulting from the reflected light and …

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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 June 18, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended June 18, 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.
FiledJuly 13, 1987
GrantedJune 18, 1991
Term endedJune 18, 2008
Patent numberCA 1284875 C
Classification (IPC)G02B9/02 +2 more

Timeline

Timeline From CIPO dates

1988199119941997200020032006Application filedJuly 13, 1987Patent grantedJune 18, 1991Term endedJune 18, 2008

Sources & verification

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