20.4
12/15/1987
RPI 895
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Official data from INPI
CIRCUITO DE RESITENCIA VARIAVEL E CIRCUITO AMPLIFICADOR DECORRENTE CONTINUA DE GANHO VARIAVEL
Em AnáliseInvention Patent
Progress at the INPI
- Filing03/31/75
- Publication
- Examination
- Allowance
- Grant
- 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: 12/15/1987. We update with every new RPI gazette, published weekly.
Applicants and inventors
Applicants
YOKOGAWA ELECTRIC WORKS LTD
Inventors
K. K. (pessoa física)
Technical data
IPC Classification
No IPC classification.
Prosecution history
Publications in the Brazilian Industrial Property Gazette (RPI).
20.4
11/01/1983
RPI 680
Carta-patente expirada
#21.1
09/21/1993
RPI 1190
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