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:
Oct. 20, 2026
Filed:
May. 09, 2025
Canon Kabushiki Kaisha, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
When a time from when a point of the surface of the charging member contacts the cleaning member until the point subsequently contacts the cleaning member again by a rotation of the charging member is defined as a rotation time A [sec], and a time constant τ of the charging member is a value represented by τ=½πfp [sec], wherein fp is a frequency at which an absolute value of an imaginary part obtained by impedance measurement of the charging member shows a maximum value, and the time constant τ is defined as an index indicating that an electric charge of the surface of the charging member is attenuated, the rotation time A and the time constant τ satisfy the following relationship: A/τ≥60, wherein the time constant τ is 1.0×10[sec] or more and 1.2×10[sec] or less.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile