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:
Dec. 07, 1976
Filed:
Apr. 11, 1975
Claude Lombard, Le Chesnay, FR;
Abstract
A tachometer circuit in accordance with the invention has two or more output states dependent upon the frequency of an applied signal. The tachometer circuit is of the type comprising at least one time-measurement circuit having two discharge paths for a capacitor which forms part of a time-constant network. One of the discharge paths is controlled by the applied signal and the other path is caused to conduct after a predetermined time. In the circuit of the present invention the discharge path to which the input signal is applied includes a thyristor or like element with a high holding current which ensures a non-controllable discharge of the capacitor, and the other discharge path comprises a unijunction transistor or like element with a low holding current.