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:
Nov. 17, 1981
Filed:
Jan. 18, 1980
Matsushita Electric Industrial Company, Limited, Osaka, JP;
Abstract
An ink ejection apparatus comprising an ink ejection unit having a liquid chamber connected to an ink container through a conduit and an air chamber connected to a source of pressurized air. Axially aligned discharge channels are provided to allow the ink in the liquid chamber to be discharged through the discharge channels. A piezoelectric transducer is mounted adjacent to the liquid chamber to generate rapid pressure increases therein to permit ejection of ink droplets to the atmosphere in response to electrical signals. The ink container is also supplied with the pressurized air from the air supply source so that there is a constant stream of air through the discharge channel and there is a static pressure balance between the air and liquid chambers when the air supply source is in operation. To eliminate the problem of pressure imbalance which could occur at the instant the air supply source is energized or de-energized, an arrangement is provided to impart a retarding action to the transitory variation of the pressure in the conduit.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile