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Expired Canadian patentCanada

Steam trap operation detector

CA 1287903 C · Owner: Tlv Co. Ltd. · Inventors: Okamoto, Masakatsu; Hosokawa, Yasutoshi; Nagase, Mamoru

CIPO record

Overview

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

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Abstract From the Canadian patent

A steam trap operation detector is provided with a vibration detecting section and an arithmetic section. The detecting section includes a probe, a diaphragm for generating ultrasonic vibration in response to mechanical vibrations sensed by the probe and a vibration sensor for converting the ultrasonic vibration into an electrical signal. The detector also includes an arithmetic section for receiving an amplified signal from the vibration sensor and processing the same into information indicative of the operation of the steam trap.

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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 August 20, 1991. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended August 20, 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.
FiledMay 6, 1988
GrantedAugust 20, 1991
Term endedAugust 20, 2008
Patent numberCA 1287903 C
Classification (IPC)F16T1/48 +2 more

Timeline

Timeline From CIPO dates

1989199119931995199719992001200320052007Application filedMay 6, 1988Patent grantedAug 20, 1991Term endedAug 20, 2008

Sources & verification

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