20.7
03/31/1987
RPI 858
The letters patent expired on 05/03/1994: 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
W. B. (pessoa física)
IPC Classification
Publications in the Brazilian Industrial Property Gazette (RPI).
03/31/1987
RPI 858
#16.1
04/26/1983
RPI 653
#13.1
02/01/1983
RPI 641
#9.1
09/28/1982
RPI 623
04/06/1982
RPI 598
#21.1
05/03/1994
RPI 1222
From the same holder
Same category
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