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:
Dec. 20, 1977
Filed:
Nov. 12, 1976
Charles T Fromknecht, Anderson, SC (US);
The Singer Company, New York, NY (US);
Abstract
A canister type vacuum cleaner having mechanism for controlling the negative pressure in the filter bag compartment by bleeding ambient air into the compartment. The mechanism includes a pivotable valve plate for overlaying an aperture in the filter bag compartment and an operator laterally slidable across the front of the cleaner and operatively connected by cam means to the valve. The valve plate is pivoted to selectively block the aperture by an amount determined by the position of the operator and the degree of negative pressure is indicated by the lateral position of the operator.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile