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:
May. 16, 1978
Filed:
Dec. 07, 1976
Applicant:
Inventors:
Berkeley Michael Ferro, Barnehurst, EN;
Rodney Edwin Spratling, Sittingbourne, EN;
Aubrey Douglas Walker, North Harrow, EN;
Assignee:
Post Office, London, EN;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G09F / ; C09D / ; C09K / ;
U.S. Cl.
CPC ...
427157 ; 283 22 ; 428211 ; 428530 ;
Abstract
A method of rendering a surface, especially a paper surface, phosphorescent, in which a composition comprising a phosphorescence activator and a soluble condensation product of formaldehyde and an amino compound is applied to the surface and is allowed to react in situ to form a phosphorescent insoluble condensation product. The composition may, for example, be in the form of a printing ink or a paper-coating mix.