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. 25, 1977
Filed:
May. 15, 1975
Damon H Duncan, Phoenix, AZ (US);
Craig T Herdman, Phoenix, AZ (US);
Terrance V Littlejohn, Phoenix, AZ (US);
Sperry Rand Corporation, New York, NY (US);
Abstract
A magnetic disc memory characterized by a symmetrical configuration in which an electrical drive motor is located along the axis of symmetry and within the normally unuseable inner diameter of a magnetic disc. The disc is secured to the rotor assembly of the electrical drive motor which rotates around a fixed stator assembly. Additionally, the storage capacity and the reliability of the memory is improved by the use of both sides of the disc, incorporation of multi-track cores to increase the number of data tracks per core, and an improved pre-loading system to properly align the gas-bearing cores with the disc during operation.