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. 24, 1995
Filed:
Jun. 25, 1992
Applicant:
Inventors:
Jae S Oh, Daejeon, KR;
Eung J Kim, Daejeon, KR;
Assignee:
Lucky Limited, Seoul, KR;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
C07C / ;
U.S. Cl.
CPC ...
560 25 ;
Abstract
The present invention relates to a process for the selective preparation of 4,4-methylene-bis-(N-phenylalkylcarbamate) which comprises condensing N-phenylalkylcarbamate with a methylating agent in the presence of an acidic ion-exchange resin or an aqueous acid as a catalyst and a non polar aprotic solvent and filtrating a condensation product at a temperature greater than the melting point of N-phenylalkylcarbamate to separate 4,4-methylene-bis-(N-phenylalkylcarbamate).