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:
Aug. 27, 1991
Filed:
Aug. 21, 1990
Applicant:
Inventor:
Kouji Nishio, Tokyo, JP;
Assignee:
Kabushiki Kaisha Topcon, Tokyo, JP;
Primary Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
128648 ; 128652 ;
Abstract
In a noncontact type tonometer including an air puff system for discharging fluid toward the cornea of an eye to be tested upon receipt of a projection signal and a pulse wave system for detecting the pulse of a patient which outputs an alternating voltage, the improvement comprising zero level detection system for detecting a zero level of the alternating voltage; and a timer which starts counting when the zero level has been detected by the zero detection systems and which outputs a projection signal to actuate the air puff system when the counted value has reached a preset time.