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:
Mar. 03, 2026
Filed:
Jul. 26, 2023
Sandisk Technologies, Inc., Miltas, CA (US);
Abhijith Prakash, Milpitas, CA (US);
Xiang Yang, Santa Clara, CA (US);
Sandisk Technologies, Inc., Milpitas, CA (US);
Abstract
A memory apparatus and method of operation are provided. The apparatus includes drain-side select gate transistors for coupling to a drain-side of memory holes of and configured to retain a transistor threshold voltage. The memory holes are arranged in rows comprising strings. The rows include semi-circle rows comprising the memory holes being partially cut by a slit half etch and full circle rows comprising the memory holes not cut. A control means is coupled to the drain-side select gate transistors of the memory holes and is configured to determine whether a downshift recovery trigger event has occurred in a plurality of memory operations. In response to determining the downshift recovery trigger event has occurred, the control means programs the transistor threshold voltage of the drain-side select gate transistors of the memory holes in at least one of the semi-circle rows to a target transistor threshold voltage.