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Official data from INPI

PROCESSO E APARELHO DE PERFILAGEM DE FURO DE SONDAGEM PARA DETERMINAR AS CARACTERÍSTICAS DE DECLÍNIO DE NEUTRONS TÉRMICOS DA FORMAÇÃO ADJACENTE AO FURO DE SONDAGEM

PublicadaInvention Patent

Application data

Number

PI8700448

Type

Invention Patent

Filing

01/30/1987

Publication

12/15/1987

Progress at the INPI

  1. Filing01/30/87
  2. Publication12/15/87
  3. Examination08/07/90
  4. Allowance07/21/92
  5. Grant03/30/93
  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: 12/15/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Prad Research and Development N.V.

NL

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Inventors

P. W. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

825.182 · 01/31/1986

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

12/15/1987

RPI 895

Pedido de patente depositado

#2.1

06/02/1987

RPI 867

Carta-patente expirada

#21.1

Patente extinta em 30/01/2002

07/29/2008

RPI 1960

Concessão da patente

#16.1

03/30/1993

RPI 1165

Deferimento

#9.1

07/21/1992

RPI 1129

Exigência - art. 36 da LPI

#6.1

12/24/1991

RPI 1099

Exigência - art. 36 da LPI

#6.1

07/02/1991

RPI 1074

Solicitação de exame técnico

#4.1

08/07/1990

RPI 1027

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