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Expired Canadian patentCanada

Electroacoustic method for nondestructively monitoring the internal temperature of objects

CA 1191244 A · Owner: Firestone Tire & Rubber Company (The) · Inventors: Divincenzo, Costantino L.

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Abstract From the Canadian patent

A method for nondestructively monitoring the internal temperature of objects having poor thermal conductance, such as tires, includes the initial steps of determining the internal temperature of a reference object or a representative portion thereof at a plurality of internal temperatures (T), measuring a plurality of pulse propagation times (tT) taken by an ultrasonic frequency pulse signal to propagate through the reference object or a representative portion thereof at the plurality of internal temperatures (T), and establishing a relationship between the determined plurality of internal temperatures (T) and the associated plurality of pulse propagation times (tT). Thereafter the unknown …

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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 July 30, 1985. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended July 30, 2002.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledApril 19, 1983
GrantedJuly 30, 1985
Term endedJuly 30, 2002
Patent numberCA 1191244 A
Classification (IPC)G01K13/00 +2 more

Timeline

Timeline From CIPO dates

1984198619881990199219941996199820002002Application filedApril 19, 1983Patent grantedJuly 30, 1985Term endedJuly 30, 2002

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