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:
Jul. 24, 2001
Filed:
Jul. 23, 1998
Ko Yamazaki, Chiba, JP;
Seiko Instruments Inc., , JP;
Abstract
An implant-type chemical supply device includes: a supply tube for supplying chemicals from a chemical tank; a pump unit having an actuating lever which is rotated by a step motor and has rollers on both ends thereof so that the rollers are arranged in contact with the halfway of the supply tube, for extruding the chemicals within the supply tube by the rollers to supply the chemicals; a waveform synthesizing circuit for producing drive pulse groups each having a different effective power; a drive circuit for supplying any one of the drive pulse groups to the step motor in synchronism with a time signal; a detection circuit for generating a non-rotation signal when an induced voltage developed in the drive coil within the step motor by free oscillations of the step motor is equal to or less than a given value after the drive pulse is supplied to the step motor; and a control circuit for controlling the drive circuit so that the drive pulse having an effective power larger by one in magnitude than that of the drive pulse during non-rotation is supplied to the step motor when the non-rotation signal is generated, and the drive pulse having an effective power smaller by one in magnitude than that of the past drive pulse during non-rotation is supplied to the step motor when no non-rotation signal is generated for a predetermined period of time.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile