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Official data from INPI

EQUIPAMENTO PARA TROCA DE CALOR ENTRE CORRENTES GASOSAS

PublicadaInvention Patent

Application data

Number

PI8705324

Type

Invention Patent

Filing

10/07/1987

Publication

04/25/1989

Progress at the INPI

  1. Filing10/07/87
  2. Publication04/25/89
  3. Examination10/02/90
  4. Allowance06/04/91
  5. Grant03/31/92
  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: 04/25/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Petróleo Brasileiro S/A - Petrobrás

RJ, BR

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Inventors

A. W. (pessoa física)

BR

J. M. (pessoa física)

J. B. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

04/25/1989

RPI 966

Pedido de patente depositado

#2.1

12/29/1987

RPI 897

Carta-patente expirada

#21.1

Patente extinta em 07/10/2002

07/29/2008

RPI 1960

Concessão da patente

#16.1

03/31/1992

RPI 1113

Notificação para pagamento de retribuição

#13.1

10/01/1991

RPI 1087

Deferimento

#9.1

06/04/1991

RPI 1070

Solicitação de exame técnico

#4.1

10/02/1990

RPI 1035

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