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:
Mar. 03, 1998
Filed:
Dec. 16, 1994
Masaharu Ikado, Suita, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A pump is arranged to prevent adhesion between pump members caused by an increase in the viscosity of ink in the pump during a standby state of the pump. The pump has a cylinder, a piston which forms an internal space in the cylinder by being closely fitted in the cylinder and which causes a change in pressure in the internal space to expel ink through the ejection outlet of the ink jet head, and a seal member provided between a shaft of the piston and the cylinder so as to closely contact the shaft and the cylinder. The piston and the cylinder are released from a state of closely contacting each other when the piston is in a standby position. In another embodiment the shaft of the piston and the seal member are released from a state of closely contacting each other when the piston is in a standby position.