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Expired Canadian patentCanada

Variable differential transformer apparatus

CA 1100584 A · Owner: Johnson Controls, Inc. · Inventors: Hilgert, Adolph J.

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

Abstract of the Disclosure, A linear variable differential transformer includes a primary winding and two secondary windings in spaced stacked relation on a core unit. The core unit includes similar cupshaped pot cores mounted in opposed opening relationship and having abutting cylindrical outer walls and spaced cylindrical inner walls define an, annular chamber within which the windings are located. A core is located within the central air gap between the inner walls and terminates in close relation to the windings. A movable stem couples the core to a pressure diaphragm transducer to locate the core in accordance with pressure. -0-

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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 5, 1981. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 5, 1998.
  • We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
FiledSeptember 20, 1978
GrantedMay 5, 1981
Term endedMay 5, 1998
Patent numberCA 1100584 A
Classification (IPC)H01F21/06 +2 more

Timeline

Timeline From CIPO dates

1979198119831985198719891991199319951997Application filedSep 20, 1978Patent grantedMay 5, 1981Term endedMay 5, 1998

Sources & verification

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