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Official data from INPI

PROCESSO PARA APERFEICOAR AS CARACTERISTICAS DE PERDA DE NUCLEO DE ESTOQUE DE FOLHA E TIRA DE ACO SILICIO E PROCESSO PARA A PRODUCAO DE FOLHA E TIRA DE ACO SILICIO

Em AnáliseInvention Patent
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Application data

Number

PI7803158

Type

Invention Patent

Filing

05/20/1977

Publication

-
View on INPI

Progress at the INPI

  1. Filing05/20/77
  2. Publication
  3. Examination
  4. Allowance06/22/82
  5. Grant01/25/83
  6. Expired11/30/93

The letters patent expired on 11/30/1993: 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: 09/13/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

ARMCO STEEL CORP

Inventors

H. M. (pessoa física)

Technical data

IPC Classification

C23D 5/00

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Pedido de licença compulsória

#20.1

09/13/1988

RPI 934

20.4

09/06/1988

RPI 933

Concessão da patente

#16.1

01/25/1983

RPI 640

Notificação para pagamento de retribuição

#13.1

10/05/1982

RPI 624

Deferimento

#9.1

06/22/1982

RPI 609

15.0

06/08/1982

RPI 607

6.2

01/26/1982

RPI 588

Carta-patente expirada

#21.1

11/30/1993

RPI 1200

Pedido de licença compulsória

#20.1

10/20/1992

RPI 1142

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