The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 04, 2005
Filed:
Jan. 11, 2002
Charles J. Thur, Broadview Heights, OH (US);
Mark E. Cipolla, Chardon, OH (US);
Craig Barbeck, North Royalton, OH (US);
Steven J. Paliobeis, Painesville, OH (US);
Charles J. Thur, Broadview Heights, OH (US);
Mark E. Cipolla, Chardon, OH (US);
Craig Barbeck, North Royalton, OH (US);
Steven J. Paliobeis, Painesville, OH (US);
Royal Appliance Mfg. Co., Glenwillow, OH (US);
Abstract
An airflow indicator for a vacuum cleaner is provided. The airflow indicator comprises a housing mounted to a casing of the vacuum cleaner. A piston chamber is defined within the housing. A piston is received in the piston chamber and is movable therein between a first position and a second position. A first port is formed in the housing and communicates with the piston chamber. The first port is open to ambient. A second port is formed in the housing and communicates with the piston chamber. The second port is spaced from the first port and is open to the filter chamber of the vacuum cleaner. A valve is mounted to the housing for obstructing air passage into the piston chamber. The valve includes a diaphragm having a slit that opens in response to a predetermined pressure differential between the first port and the second port.