Communications: electrical – Digital comparator systems
Patent
1975-06-04
1977-06-28
Fears, Terrell W.
Communications: electrical
Digital comparator systems
340173CH, G11C 1300, G11C 1302
Patent
active
040329011
ABSTRACT:
Disclosed is a system for retrievably storing information in a storage medium comprising a laterally extending layer of separate particles each of which has a size of several hundred Angstroms or less. The individual particles are up to approximately the size of protein molecules or virus particles and can, in fact, be single biological macromolecules, single virus particles, single polystyrene latex particles or other particles or aggregates of equivalent size. The particles may form a monolayer, or they may form a thicker slab as long as the slab surface is smooth compared to the size of a region of the slab used for the storage of a single bit of information. Small regions of this laterally extending layer or its surface, with lateral dimensions of a few thousand Angstroms or less, typically 1000A or less, can be selectively modified by a narrowly focused electron beam without substantially affecting adjacent regions, to thereby store (write in) information as a pattern of modified particles. After the slab surface has been so modified, it can be stabilized by depositing thereon a thin metallic film, and the stored information can be read out by a detecting electron beam.
REFERENCES:
patent: 3119099 (1964-01-01), Biernat
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