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:
Sep. 30, 1980
Filed:
Jan. 24, 1979
Ronald G Neale, Carshalton Beeches, GB;
Grady M Wood, FL, US;
Harris Corporation, Melbourne, FL (US);
Abstract
The Write/Erase lifetimes of amorphous memory devices are extended by applying a multilevel erase pulse wherein the first stage has a current amplitude sufficient to heat the crystal filament to the phase change temperature but not to provide the energy for the phase change and erasure of the crystal structure and the second stage has a current amplitude sufficient to heat the filament to remove the crystal structure. Preferably the first stage current is equal to the write current and the second stage is equal to the write current times the ratio of the electrical conductivity of the amorphous conducting state to the apparent conductivity of the crystalline state.