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Official data from INPI

PROCESSO DE RESTAURAÇÃO E MANUTENÇÃO DE PERMEABILIDADE AUMENTADA EM FORMAÇÃO SUBTERRÂNEA DE ARENITO PORTADORA DE HIDROCARBONETOS E PERFURADA POR POÇO

Em AnáliseInvention Patent

Application data

Number

PI8700947

Type

Invention Patent

Filing

02/26/1987

Publication

01/05/1988

Progress at the INPI

  1. Filing02/26/87
  2. Publication01/05/88
  3. Examination09/05/89
  4. Allowance10/23/90
  5. Grant07/30/91
  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.

Talk to a specialist

Latest action published by the INPI: 09/05/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Marathon Oil Company

US

See this company's full portfolio

Inventors

R. S. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

853.305 · 04/17/1986

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Solicitação de exame técnico

#4.1

09/05/1989

RPI 985

Publicação do pedido de patente

#3.1

01/05/1988

RPI 898

Pedido de patente depositado

#2.1

06/16/1987

RPI 869

Carta-patente expirada

#21.1

Patente extinta em 26/02/2002

07/29/2008

RPI 1960

Concessão da patente

#16.1

07/30/1991

RPI 1078

Notificação para pagamento de retribuição

#13.1

02/05/1991

RPI 1053

Deferimento

#9.1

10/23/1990

RPI 1038

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