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Official data from INPI

PROCESSO E APARELHO DE PERFILAGEM PARA MEDIR A RESISTIVIDADE ELÉTRICA DE UMA FORMAÇÃO DE TERRA ATRAVESSADA POR UM FURO DE SONDAGEM

Arquivada/ExtintaInvention Patent

Application data

Number

PI9000757

Type

Invention Patent

Filing

02/19/1990

Publication

01/22/1991

Progress at the INPI

  1. Filing02/19/90
  2. Publication01/22/91
  3. Examination07/13/93
  4. Allowance09/13/94
  5. Grant03/28/95
  6. Expired05/11/10

The letters patent expired on 05/11/2010: 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: 05/11/2010. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Schlumberger Surenco, S.A

PA

See this company's full portfolio

Inventors

J. T. (pessoa física)

FR

M. G. (pessoa física)

FR

Technical data

IPC Classification

Priority claims

FR

89 02158 · 02/20/1989

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Carta-patente expirada

#21.1

Patente extinta em 19/02/2005

05/11/2010

RPI 2053

Concessão da patente

#16.1

03/28/1995

RPI 1269

Deferimento

#9.1

09/13/1994

RPI 1241

Solicitação de exame técnico

#4.1

07/13/1993

RPI 1180

4.2.1

07/13/1993

RPI 1180

Solicitação de exame não realizada

#4.2

05/04/1993

RPI 1170

Publicação do pedido de patente

#3.1

01/22/1991

RPI 1051

Pedido de patente depositado

#2.1

05/15/1990

RPI 1018

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