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:
Dec. 24, 1985
Filed:
May. 12, 1983
Frederick F Geyer, Rochester, NY (US);
Eastman Kodak Company, Rochester, NY (US);
Abstract
An optical write/read unit includes a support, an overlying record layer that is constructed for writing or reading with a predetermined light wavelength(s) and is absorptive to light of other wavelengths and a protective cover means that is selectively transparent to light of at least one of said predetermined wavelength(s). In one embodiment the disc unit is adapted for writing and reading with the same light wavelength and the cover means blocks other light wavelengths. In another embodiment the disc unit is adapted to reading with light of wavelength substantially different than the writing wavelength and the cover means selectively transmits the operative (write and read) wavelengths and selectively blocks a large proportion of other light wavelengths. In another embodiment the cover means is selectively transmissive to the reading wavelength and is displaceable to permit writing light onto the record layer.