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:
May. 09, 1995
Filed:
Sep. 04, 1991
Applicant:
Inventor:
Alexander Lempicki, Boston, MA (US);
Assignee:
Trustee of Boston University, Boston, MA (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
252586 ; 252589 ;
Abstract
A photochromic plastic has been discovered which is useful in the manufacture of protective eyeglasses. The photochromic plastic comprises a host polymer material and a dopant. The plastic exhibits photochromic properties due to excited state absorption which occurs when the material is exposed to UV light. The eyeglasses function as protection against radiation from the sun as well as from industrial and other sources. The dynamic range and response time of this novel photochromic plastic may be tailored in accordance with the particular use or application desired.