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:
Nov. 06, 1984
Filed:
Nov. 19, 1982
Applicant:
Inventors:
Stephen R Postle, Brentwood, GB;
James Doyle, Wickford, GB;
Assignee:
Ciba-Geigy AG, Basel, CH;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B44D / ;
U.S. Cl.
CPC ...
428323 ; 428327 ; 428412 ; 428484 ; 4284782 ; 428910 ;
Abstract
A transparent sheet material which is suitable for projection on overhead projectors comprises coated onto a support a binder layer containing discrete particles of an organic polymer which has substantially the same refractive index as the binder, the polymer comprising from 0.5 to 30% by weight of the binder. The coating gives a good key for typewritten characters produced by carbon ribbon or ink ribbon typewriters, for writing with e.g. ball-point pen, pencil, water or solvent based ink pens, Indian ink and inked rubber stamps.