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:
Jun. 21, 2005
Filed:
Oct. 01, 2003
Applicants:
Nabil M. Lawandy, North Kingstown, RI (US);
Timothy J. Driscoll, Pawtucket, RI (US);
Charles M. Zepp, Hardwick, MA (US);
Inventors:
Nabil M. Lawandy, North Kingstown, RI (US);
Timothy J. Driscoll, Pawtucket, RI (US);
Charles M. Zepp, Hardwick, MA (US);
Assignee:
Spectra Systems Corporation, Providence, RI (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B41M005/30 ;
U.S. Cl.
CPC ...
Abstract
Thermochromic compositions that include combinations of at least one color former and at least one Lewis acid in a polymer mixture are disclosed. The thermochromic compositions reversibly change appearance from substantially transparent to substantially non-transparent above a lower critical solution temperature.