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:
Oct. 30, 1979
Filed:
Aug. 30, 1977
Applicant:
Inventor:
Marvin S Towsend, Oxon Hill, MD (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G09F / ;
U.S. Cl.
CPC ...
40544 ;
Abstract
A writing and display apparatus which includes a unified writing and display surface exhibiting a reference luminosity; and a hand-held write/erase instrument which is used to apply writing energy to said surface of reference luminosity thereby causing writing to be displayed and retained for an appropriate length of time, and which is also used to apply erasing energy directly to said retained, displayed writing thereby causing the writing to be erased.