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:
Sep. 24, 1991
Filed:
Jan. 03, 1989
Alfred C Schmidt, Wilton, CT (US);
Other;
Abstract
A machine control and accounting arrangement for controlling operation of a machine includes a secure housing, an electronic control system within the housing, and first and second interfaces coupled to the control system to permit communication between the control system and devices external of said housing. The first interface comprising an arrangement for applying a count signal to the control system. The second interface comprising an arrangement for applying encrypted control signals to the control system. The control system includes a first register for storing a current count corresponding to the count signal, a second register for storing an authorization count, an arrangement for applying an enable signal to the first interface when the count of the first register does not exceed the count of the second register, a decoding arrangement for decrypting control signals applied thereto to produce a decrypted signal, and an arrangement responsive to a valid decrypted signal for modifying the count in the second register.