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Official data from INPI

PROCESSO PARA REAPROVEITAMENTO DE REJEITOS SIDERÚRGICOS

ConcedidaInvention Patent
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Application data

Number

PI8400324

Type

Invention Patent

Filing

01/26/1984

Publication

09/03/1985
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Progress at the INPI

  1. Filing01/26/84
  2. Publication09/03/85
  3. Examination02/25/86
  4. Allowance04/25/89
  5. Grant11/28/89
  6. Expired07/08/08

The letters patent expired on 07/08/2008: 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: 11/28/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Companhia Siderúrgica Nacional - CSN

RJ, BR

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Inventors

E. P. (pessoa física)

BR

P. A. (pessoa física)

BR

Technical data

IPC Classification

C21B 3/06C22B 1/248C22B 7/04

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

11/28/1989

RPI 997

Notificação para pagamento de retribuição

#13.1

08/22/1989

RPI 983

Deferimento

#9.1

04/25/1989

RPI 966

Exigência - art. 36 da LPI

#6.1

12/06/1988

RPI 946

Exigência - art. 36 da LPI

#6.1

04/05/1988

RPI 911

Solicitação de exame técnico

#4.1

02/25/1986

RPI 801

Publicação do pedido de patente

#3.1

09/03/1985

RPI 776

Pedido de patente depositado

#2.1

04/10/1984

RPI 703

Carta-patente expirada

#21.1

Patente extinta em 26/01/99

07/08/2008

RPI 1957

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