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. 18, 1976
Filed:
Apr. 25, 1974
Robert H Livesay, West Chester, PA (US);
Sun Oil Company of Pennsylvania, Philadelphia, PA (US);
Abstract
A slope change detector circuit uses a differential amplifier to produce an output signal having two levels, the change of one to the other of which is indicative of a slope change in an input electrical signal. A first input of the differential amplifier communicates directly with a signal source, while a second input communicates with a signal source through a delay network. The delay network includes a switching circuit between the signal source and the differential amplifier comprising a field-effect-transistor and a capacitor; and a feed back circuit comprising a circuit that derives the absolute value of the differential amplifier's output signal and a level detecting zener diode that causes the field effect transistor to change resistance when the absolute value signal reaches a predetermined level.