20.7
03/31/1987
RPI 858
The letters patent expired on 07/06/1993: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.
Talk to a specialistLatest action published by the INPI: 03/31/1987. We update with every new RPI gazette, published weekly.
Applicants
NALCO CHEMICAL CO
Inventors
No inventors listed.
IPC Classification
No IPC classification.
Publications in the Brazilian Industrial Property Gazette (RPI).
03/31/1987
RPI 858
#22.1
08/19/1986
RPI 826
#13.1
06/01/1982
RPI 606
#9.1
01/26/1982
RPI 588
#21.1
07/06/1993
RPI 1179
From the same holder
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