20.7
03/17/1987
RPI 856
The letters patent expired on 11/17/1992: 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: 03/17/1987. We update with every new RPI gazette, published weekly.
Applicants
Nalco Chemical Company
US
Inventors
E. B. (pessoa física)
IPC Classification
No IPC classification.
Publications in the Brazilian Industrial Property Gazette (RPI).
03/17/1987
RPI 856
03/10/1987
RPI 855
#16.1
07/01/1980
RPI 506
#21.1
11/17/1992
RPI 1146
From the same holder
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