Carta-patente expirada
#21.1
Patente extinta em 09/10/2010
05/28/2013
RPI 2212
Application data
Number
PI9007812Type
Filing
Publication
PCT
US1990005762 The letters patent expired on 05/28/2013: 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: 05/28/2013. We update with every new RPI gazette, published weekly.
Applicants
The Dow Chemical Company
US
Inventors
A. C. (pessoa física)
US
IPC Classification
Priority claims
US
433,630 · 11/08/1989
Abstract
A velocidade de filtração e a viscosidade de uma lama de argila são melhoradas pela adição de uma polialquileno-poliamina e, opcionalmente, em látex. O aditivo é particularmente útil no beneficiamento de argila.
Publications in the Brazilian Industrial Property Gazette (RPI).
#21.1
Patente extinta em 09/10/2010
05/28/2013
RPI 2212
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