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. 01, 1992
Filed:
Apr. 30, 1991
Applicant:
Inventors:
Mark R Buckingham, Essex, GB;
Christopher M Evans, Essex, GB;
Richard J Ellis, Essex, GB;
Andrew C Jackson, Leeds, GB;
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G11B / ; C09B / ;
U.S. Cl.
CPC ...
430270 ; 430495 ; 430945 ; 346 / ; 3461351 ;
Abstract
An optical recording element comprising a substrate and as a recording medium a layer comprising a dye having a nucleus of general formula (I): ##STR1## wherein: each Y and Z is independently selected from the group consisting of hydrogen and --XR wherein X is selected from the group consisting of S, Se and Te and R represents an organic radical; with the proviso that one and only one of Y and Z on each phenyl ring must be other than H, and