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:
Apr. 17, 1979
Filed:
Dec. 21, 1977
Karl-Heinz Klingler, Langen, DE;
Erich Bickel, Frankfurt am Main, DE;
Deutsche Gold- und Silber-Scheideanstalt vormals Roessler, Frankfurt am Main, DE;
Abstract
Basic substituted alkyl theophylline derivatives of the formula ##STR1## in which Alk is a straight or branched chain alkylene group with 2 to 4 carbon atoms and R is hydrogen or a methyl group are produced by catalytic hydrogenation of compounds of the formula ##STR2## where the phenolic hydroxyl groups and/or the secondary basic nitrogen atom can contain protective groups using as the solvent a compound of the formula ##STR3## where R', R' and R'' are the same or different and are alkyl groups of 1 to 2 carbon atoms and R' together with R'' can also be an alkylene bridge with 3 to 4 carbon atoms and in a given case the protective groups present are split off.