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Official data from INPI

PROCESSO PARA UTILIZAÇÃO DA ESCÓRIA DE ALTO FORNO NA RETENÇÃO DE ÓLEOS SOBRENADANTES EM ÁGUAS CORRENTES

Em AnáliseInvention Patent

Application data

Number

PI8703705

Type

Invention Patent

Filing

07/15/1987

Publication

01/31/1989

Progress at the INPI

  1. Filing07/15/87
  2. Publication01/31/89
  3. Examination01/16/90
  4. Allowance01/22/91
  5. Grant08/27/91
  6. Expired07/29/08

The letters patent expired on 07/29/2008: 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: 10/17/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Companhia Siderúrgica Nacional - CSN

RJ, BR

See this company's full portfolio

Inventors

G. F. (pessoa física)

BR

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

15.15

10/17/1989

RPI 991

Publicação do pedido de patente

#3.1

01/31/1989

RPI 954

Pedido de patente depositado

#2.1

07/12/1988

RPI 925

Carta-patente expirada

#21.1

Patente extinta em 15/07/2002

07/29/2008

RPI 1960

Concessão da patente

#16.1

08/27/1991

RPI 1082

Notificação para pagamento de retribuição

#13.1

05/14/1991

RPI 1067

Deferimento

#9.1

01/22/1991

RPI 1051

Solicitação de exame técnico

#4.1

01/16/1990

RPI 1002

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