I did a quick search in the Pluspat file on Questel.Orbit on 63020 as patent
number and got 17 hits and I think (former) East German patent document
DD63020 is your most likely candidate.
See esp@cenet:
http://l2.espacenet.com/dips/bnsviewer?CY=ep&LG=en&DB=EPD&PN=DD63020&ID=DD++
+++63020A++I+
E G A Winckel
Head Patent Analysis
Shell International B.V.
PO Box 384, 2501 CJ The Hague, The Netherlands
Tel: +31 (0)70 377 2981 Fax: 6141
Email: ed.g.a.winckel@si.shell.com
Internet: http://www.shell.com
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