Official data from INPI

SEM TITULO

ConcedidaInvention Patent

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Application data

Number

PI7508128

Type

Invention Patent

Filing

12/09/1975

Publication

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Progress at the INPI

Filing12/09/75
Publication
Examination
Allowance
Grant11/10/81
Expired07/01/08

The letters patent expired on 07/01/2008: the term of protection has ended. The technology is in the public domain and may be freely used in Brazil.

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Latest action published by the INPI: 11/10/1981. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Sumitomo Aluminium Smelting CO., LTD

Sumitomo Chemical Company, Limited

Inventors

M. K. (pessoa física)

N. T. (pessoa física)

N. M. (pessoa física)

Y. K. (pessoa física)

Technical data

IPC Classification

C25C 3/06

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

11/10/1981

RPI 577

Carta-patente expirada

#21.1

Patente extinta em 09/12/90

07/01/2008

RPI 1956

Licença compulsória (variante)

#20.2

10/08/1996

RPI 1349

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PROCESSO PARA PRODOZIR GRÃOS GROSSOS DE HIDRÓXIDO DE ALUMÍNIO

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