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. 05, 1983
Filed:
Apr. 01, 1981
Jaroslav Petranek, Prague, CS;
Olen Ryba, Prague, CS;
Miloslav Semler, Turnov, CS;
Miroslav Panoch, Turnov, CS;
Ceskoslovenska akademie ved, Prague, CS;
Abstract
Polymeric membrane selective to calcium (II) ions. The invention relates to a polymeric membrane selective to calcium (II) ions, formed by a solid film of plastic material, advantageously of poly(vinyl chloride), which contains an active neutral carrier in a plasticizer of the used plastic material. The active carrier is a complex of macrocyclic polyetherdiamides of the general formula ##STR1## where R.sub.1, R.sub.2, R.sub.3, R.sub.4 are H or alkyl containing 1 to 4 carbon atoms, advantageously methyl, R.sub.5 and R.sub.6 mean alkyl or arylalkyl with 6 to 10 carbon atoms, advantageously benzyl, with the calcium (II) ions and a lipophilic organic anion, advantageously with tetraphenylborate or tetra(p-chlorophenyl)borate anion.