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Official data from INPI

PROCESSO PARA PRODUZIR UM DISPERSANTE/APERFEIÇOADOR DE ÍNDICE DE VISCOSIDADE (IV), E, COMPOSIÇÃO LUBRIFICANTE

Arquivada/ExtintaInvention Patent

Application data

Number

PI8905156

Type

Invention Patent

Filing

10/11/1989

Publication

05/15/1990

Progress at the INPI

  1. Filing10/11/89
  2. Publication05/15/90
  3. Examination05/26/92
  4. Allowance03/26/96
  5. Grant03/25/97
  6. Expired12/29/09

The letters patent expired on 12/29/2009: 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: 12/29/2009. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Shell Internationale Research Maatschappij B.V

NL

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Inventors

A. Z. (pessoa física)

NL

G. K. (pessoa física)

NL

Technical data

IPC Classification

Priority claims

GB

8824037.9 · 10/13/1988

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Carta-patente expirada

#21.1

Patente extinta em 11/10/2004

12/29/2009

RPI 2034

Concessão da patente

#16.1

03/25/1997

RPI 1373

Republicação - classificação IPC

#15.11

02/25/1997

RPI 1369

Deferimento

#9.1

03/26/1996

RPI 1321

Exigência - art. 36 da LPI

#6.1

02/07/1995

RPI 1262

Solicitação de exame técnico

#4.1

05/26/1992

RPI 1121

Publicação do pedido de patente

#3.1

05/15/1990

RPI 1018

Pedido de patente depositado

#2.1

03/01/1990

RPI 1007

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