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:
Feb. 01, 1977
Filed:
Aug. 29, 1975
Applicant:
Inventor:
Chi Fang Tung, Mahtomedi, MN (US);
Assignee:
Minnesota Mining and Manufacturing Company, St. Paul, MN (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09F / ;
U.S. Cl.
CPC ...
4013 / ; 4013 / ; 40135 ; 428143 ;
Abstract
Internally illuminated signs incorporating light-transmissive retroreflective sheeting between the internal illumination source and the sign face in position to retroreflect light beamed against the sign face so as to make the signs retroreflective. Preferred sheeting comprises an open web of filaments encased by retroreflective microspheres.
Tung, Chi. (1977). Internally illuminated retroreflective signs (U.S. Patent No. 4005538). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4005538
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile