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. 24, 1996
Filed:
Dec. 27, 1994
Robert R Birge, Onodaga County, NY (US);
Syracuse University, Syracuse, NY (US);
Abstract
A high density volmetric optical memory stores information in three dimensions by selectively activating a photochemical branching reaction from a short-lived thermal intermediate of the primary photocycle of a light-transducing protein storage medium. A paging laser actuates a selected planar sheet or page of the medium at one wavelength, and data lasers send selected data beams at another wavelength orthogonal to the selected page. In a preferred mode, the medium is bacteriorhodopsin, and the paging beam raises the photocycle from the ground or resting state bR to an intermediate O, and the data beams interact with the O intermediate to create branch species P and Q. The data beams do not interract strongly with bR or with the P or Q. A differential read operation can employ the same paging and data wavelengths. Preferably a partial conversion only is required, with [95% bR, 5% P+Q] representing '0' and [90% bR, 10% P+Q] representing '1'.