Carta-patente expirada
#21.1
Patente extinta em 28/12/2003
09/02/2008
RPI 1965
Application data
Number
PI8807868Type
Filing
Publication
PCT
US1988004675 The letters patent expired on 09/02/2008: 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: 09/02/2008. We update with every new RPI gazette, published weekly.
Applicants
Hydril Company
US
Inventors
G. K. (pessoa física)
US
K. M. (pessoa física)
US
L. T. (pessoa física)
US
P. B. (pessoa física)
US
IPC Classification
Priority claims
US
138,667 · 12/28/1987
Publications in the Brazilian Industrial Property Gazette (RPI).
#21.1
Patente extinta em 28/12/2003
09/02/2008
RPI 1965
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