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:
Sep. 25, 2018
Filed:
Feb. 02, 2017
Hewlett-packard Development Company, L.p., Houston, TX (US);
Ning Ge, Palo Alto, CA (US);
Trudy Benjamin, Portland, OR (US);
Teck-Khim Neo, Singapore, SG;
Joseph M. Torgerson, Philomath, OR (US);
Neel Banerjee, Corvallis, OR (US);
George H. Corrigan, III, Corvallis, OR (US);
HEWLETT-PACKARD DEVELOPMENT COMPANY, L.P., Houston, TX (US);
Abstract
In some examples, an ink level sensor includes a sense capacitor between a first node and ground, a first switch to couple a first voltage to the first node and charge the sense capacitor, a second switch to couple the first node with a second node and share the charge between the sense capacitor and a reference capacitor, causing a second voltage at the second node, and a transistor having a drain, a gate coupled to the second node, and a source coupled to ground, the transistor to provide a drain to source resistance in proportion to the second voltage.