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Official data from INPI

PROCESSO PARA PRODUCAO DE ALUMINA ANIDRA A PARTIR DE TRI-HIDRATO DE ALUMINA,ALUMINA ASSIM PRODUZIDA,E APARELHO PARA O DITO PROCESSO

ConcedidaInvention Patent

Application data

Number

PI7902452

Type

Invention Patent

Filing

04/20/1978

Publication

-

Progress at the INPI

  1. Filing04/20/78
  2. Publication
  3. Examination
  4. Allowance11/23/82
  5. Grant06/28/83
  6. Expired06/21/94

The letters patent expired on 06/21/1994: 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: 06/28/1983. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

SMIDTH & CO AS F L

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Inventors

R. B. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

06/28/1983

RPI 662

Notificação para pagamento de retribuição

#13.1

04/05/1983

RPI 650

Deferimento

#9.1

11/23/1982

RPI 631

15.0

05/18/1982

RPI 604

Exigência - art. 36 da LPI

#6.1

03/09/1982

RPI 594

Carta-patente expirada

#21.1

06/21/1994

RPI 1229

20.4

04/02/1991

RPI 1061

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