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Official data from INPI

DISPOSITIVO DESOBSTRUIDOR DE CÂMARAS DE COMBUSTÃO DE FORNOS DE COQUE

Arquivada/ExtintaInvention Patent

Application data

Number

PI8906036

Type

Invention Patent

Filing

11/30/1989

Publication

06/04/1991

Progress at the INPI

  1. Filing11/30/89
  2. Publication06/04/91
  3. Examination04/07/92
  4. Allowance03/04/97
  5. Grant09/30/97
  6. Expired05/21/13

The letters patent expired on 05/21/2013: 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: 05/21/2013. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Usinas Siderúrgicas de Minas Gerais S/A - Usiminas (Grupo Siderbrás)

MG, BR

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Inventors

J. R. (pessoa física)

BR

N. A. (pessoa física)

BR

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Carta-patente expirada

#21.1

Patente extinta em 30/11/2009

05/21/2013

RPI 2211

Concessão da patente

#16.1

09/30/1997

RPI 1400

Deferimento

#9.1

03/04/1997

RPI 1370

15.5

08/29/1995

RPI 1291

Solicitação de exame técnico

#4.1

04/07/1992

RPI 1114

Publicação do pedido de patente

#3.1

06/04/1991

RPI 1070

Pedido de patente depositado

#2.1

03/20/1990

RPI 1010

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