Vacuum cleaner condition indicator and safety device
CA 1077207 A · Owner: Singer Company (The) · Inventors: Fromknecht, Charles T.
Overview
Its claims, description and drawings are in the Canadian Patents Database.
Open the CIPO recordAbstract From the Canadian patent
A vacuum cleaner detector that indicates when the hose is clogged and bleeds in cooling air to the vacuum chamber so as to prevent overheating of the motor blower. The indicator comprises an actuator valve and a relief valve. The actuator valve includes a pressure responsive member having filter bag compartment pressure applied to one side thereof and atmospheric pressure applied to the other side. When the absolute pressure within the filter bag chamber drops, the pressure responsive member is moved toward the low pressure side moving a plunger which opens a port when the pressure drops below that desired to allow filter bag chamber pressure to vent to the low pressure side of a pressure …
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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 13, 1980. A Canadian patent filed before October 1, 1989 lasted 17 years from grant, so its term ended May 13, 1997.
- We check Canadian rights only. A patent in its family in another country could still be in force: check its family on Google Patents.
Timeline
Timeline From CIPO dates
Sources & verification
Official CIPO records
Everything on this page comes from the CIPO record linked above. Contains information licensed under the Open Government Licence – Canada.