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. 19, 1989
Filed:
Sep. 22, 1988
Applicant:
Inventors:
William C Robinson, Concord, MA (US);
Norman A Sanford, Arlington, MA (US);
Assignee:
Polaroid Corporation, Cambridge, MA (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G02B / ;
U.S. Cl.
CPC ...
350 9613 ;
Abstract
An external light modulator which relies on efficient changes in electro-optic coupling of light between copolarized guided modes in a single waveguide channel formed in a lithium niobate or lithium tantalate substrate by proton exchange with benzoic acid.