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:
May. 29, 1990
Filed:
Feb. 21, 1989
Sigeru Tezuka, Saitama, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A quantitative pipette comprising a cylinder, a plunger inserted into the cylinder capable of sucking and discharging a prescribed amount of liquid by the movement of the plunger at a prescribed distance, a ratchet having plural teeth at regular intervals, a driving means for rotating the ratchet, a damping means for damping the rotation of the ratchet not faster than a prescribed speed, a ratchet-engaging means capable of engaging the ratchet to stop it so as to permit the rotation of the ratchet intermittently, a pinion rotating simultaneously with the ratchet, a rack engaging the pinion and fixing said plunger, and a rotary means for rotating from the outside said ratchet or pinion opposed to the driving force of said driving means.