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Indicator device for a filter, vacuum cleaner, and method of filtering a vacuum cleaner exhaust stream

  • US 8,647,408 B2
  • Filed: 04/27/2011
  • Issued: 02/11/2014
  • Est. Priority Date: 05/05/2010
  • Status: Expired due to Fees
First Claim
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1. An indicator device for a filter comprising:

  • a filter replacement indicator that is actuatable by thermal expansion, andan actuating member including a medium configured to thermally expand so as to actuate the filter replacement indicator,wherein the actuating member includes an actuating lever that is movable in response to thermal expansion of the medium.

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