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:
Jan. 27, 1981
Filed:
May. 10, 1979
Thomas K Hiniker, Mankato, MN (US);
Vincent N Bush, Madison Lake, MN (US);
Hiniker Company, Mankato, MN (US);
Abstract
A protected memory circuit for use with an electronic data system includes a memory element such as a shift register, and memory control or lock means to selectively control enablement of the memory element for read/write operations. A separate power supply which may be a charged capacitor is used to power the memory and memory lock circuits in case of a power interruption in the main system with which the memory is being used, so that volatile data can be stored for re-use by the main system after the main power is restored. The lock includes a counter and a gate for inhibiting clock pulses to the memory element until a predetermined number of control pulses have been received to initiate a read/write operation. At all other times the clock input is blocked or clamped to prevent spurious signals or power surge transients from altering the stored data.