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. 30, 1986
Filed:
Dec. 20, 1985
Donald F Kaiser, Parsippany, NJ (US);
Beckman Industrial Corporation, Cedar Grove, NJ (US);
Abstract
Apparatus for generating a constant current, comprising a storage device for storing a voltage corresponding to the constant current, the storage device including a resistor-capacitor filter and having an input and an output; a Zener diode for supplying a constant voltage; a first high off-state impedance device for connecting the Zener diode to the input in response to a first actuation signal; a second high off-state impedance device for connecting the input to a source of discharge potential in response to a second actuation signal; a microprocessor for supplying the first actuation signal to the first high off-state impedance device for a first time interval and the second actuation signal to the second off-state impedance device thereafter for a second time interval, and then providing no first and second actuation signals for a third time interval much greater than the combined first and second time intervals; and a voltage-to-current converting circuit connected to the output and having a high input impedance, for converting the voltage stored in the storage device to the constant current.