Publicação do pedido de patente
#3.1
07/05/1988
RPI 924
Application data
Number
PI8702452Type
Filing
Publication
The letters patent expired on 07/29/2008: 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: 07/05/1988. We update with every new RPI gazette, published weekly.
Applicants
Chevron Research Company
US
Inventors
C. D. (pessoa física)
US
T. N. (pessoa física)
US
Publications in the Brazilian Industrial Property Gazette (RPI).
#3.1
07/05/1988
RPI 924
#2.1
08/04/1987
RPI 876
#15.11
As classificações anteriores eram: E21B 47/00, E21B 43/24.
08/28/2012
RPI 2173
#21.1
Patente extinta em 13/05/2002
07/29/2008
RPI 1960
#16.1
05/26/1992
RPI 1121
#13.1
12/17/1991
RPI 1098
#9.1
08/20/1991
RPI 1081
#4.1
11/13/1990
RPI 1041
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