Concessão da patente
#16.1
01/25/1983
RPI 640
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Official data from INPI
APERFEICOAMENTO EM PROCESSO DE PRODUCAO DE DITIONITO DE SODIO A PARTIR DE DIOXIDO DE ENXOFRE,FORMIATO DE SODIO E CARBONATO DE SODIO COM UM MINIMO DE SOLVENTE
ConcedidaInvention Patent
Progress at the INPI
- Filing06/24/76
- Publication
- Examination
- Allowance06/22/82
- Grant01/25/83
- Expired07/13/93
The letters patent expired on 07/13/1993: 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: 01/25/1983. We update with every new RPI gazette, published weekly.
Applicants and inventors
Applicants
VIRGINIA CHEMICALS INC
Inventors
B. L. (pessoa física)
W. C. (pessoa física)
Technical data
IPC Classification
Prosecution history
Publications in the Brazilian Industrial Property Gazette (RPI).
Notificação para pagamento de retribuição
#13.1
10/05/1982
RPI 624
Deferimento
#9.1
06/22/1982
RPI 609
Exigência - art. 36 da LPI
#6.1
11/10/1981
RPI 577
Carta-patente expirada
#21.1
07/13/1993
RPI 1180
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