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:
Jan. 18, 1994
Filed:
Sep. 03, 1992
Rainer Kaufmann, D-2000 Hamburg 55, DE;
Gunther Herrnring, D-2081 Alvesloe, DE;
Other;
Abstract
Solids which are soluble in a common solvent or solvent mixture, possibly containing a common high-boiling substance of common marker liquids for writing instruments with a common capillary feeder opening, with a melting point .gtoreq.30.degree. C. and a molecular weight .ltoreq.1000 daltons, and which, when they are the sole ingredient in the solvent or solvent mixture, crystallize on the feeder opening, forming outwardly growing crystallites, can be used as antiblocking additives for such marker liquids in a proportion of at leat 1% in weight, relative to the final composition of the marker liquid, for protective and anti-evaporating closure of the capillary feeder opening when it is unprotected and not in use.