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. 30, 1977
Filed:
Aug. 04, 1975
Andrew Gordon Dingwall, Somerville, NJ (US);
RCA Corporation, New York, NY (US);
Abstract
A monolithic array of insulated gate field effect transistors useful, for example, as a read-only memory, has means for defining a pre-selected array of operative and non-operative transistors in a row and column arrangement. Non-operative transistors include diffused regions lying in the conductive channel zones thereof which serve to raise the value of the threshold voltage of these transistors above a value normally applied to the gate electrodes of all the transistors in the operation of the device. Operative transistors have no such threshold-raising diffused regions in their channel zones so that they can be turned on by the normally applied voltage. The array is programmable by means of a single photomask.