20.4
12/22/1987
RPI 896
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Official data from INPI
DISPOSITIVO DE FORNECIMENTO DE CORRENTE CONTINUA DE CONTROLE
Em AnáliseInvention Patent
Progress at the INPI
- Filing04/21/75
- Publication
- Examination
- Allowance
- Grant12/29/81
- Expired09/21/93
The letters patent expired on 09/21/1993: 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: 12/22/1987. We update with every new RPI gazette, published weekly.
Applicants and inventors
Applicants
YOKOGAWA ELECTRIC WORKS LTD
Inventors
U. H. (pessoa física)
W. Y. (pessoa física)
Technical data
IPC Classification
Prosecution history
Publications in the Brazilian Industrial Property Gazette (RPI).
20.10
12/15/1987
RPI 895
20.4
12/15/1987
RPI 895
20.4
11/01/1983
RPI 680
Concessão da patente
#16.1
12/29/1981
RPI 584
Carta-patente expirada
#21.1
09/21/1993
RPI 1190
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