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. 14, 1990
Filed:
Oct. 21, 1985
Logan L Pease, Reno, NV (US);
William Wells, Reno, NV (US);
IGT, Reno, NV (US);
Abstract
A look ahead state saving device for maintaining an audit trail of a plurality of discrete, sequential operating states in an electronic machine, such as a gaming machine. Each such state include accompanying operational data. A nonvolatile solid state memory maintains the audio trail. Game operation is initially interrupted and, thereafter, current state data is frozen in the memory when power source unreliability is detected and reliable machine operation cannot be maintained. The device retrieves the most recent game states and operational data from the memory upon restoration of power source reliability. Memory nonvolatility is maintained by a back-up battery source that includes a battery low detection circuit for interrupting machine operation in the event of battery failure, and that also includes a battery charging circuit.