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Official data from INPI

PROCESSO PARA APERFEIÇOAR AS CARACTERÍSTICAS DE VISCOSIDADE CINEMÁTICA E DE COEFICIENTE DE TRAÇÃO DE ÓLEOS E OUTROS MATERIAIS DE BASE DE LUBRIFICANTES, E, FLUIDO DE TRAÇÃO

Prazo de SigiloInvention Patent
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Application data

Number

PI8903177

Type

Invention Patent

Filing

06/28/1989

Publication

02/13/1990
View on INPI

Progress at the INPI

  1. Filing06/28/89
  2. Publication02/13/90
  3. Examination03/24/92
  4. Allowance08/04/98
  5. Grant12/29/98
  6. Expired12/26/12

The letters patent expired on 12/26/2012: 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: 09/19/1989. 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

M. D. (pessoa física)

GB

Technical data

IPC Classification

C10M 105/74C10N 40/04

Priority claims

GB

8815754 · 07/01/1988

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Pedido de patente depositado

#2.1

09/19/1989

RPI 987

Carta-patente expirada

#21.1

Patente extinta em 28/06/2009

12/26/2012

RPI 2190

Concessão da patente

#16.1

12/29/1998

RPI 1460

Deferimento

#9.1

08/04/1998

RPI 1441

Exigência - art. 36 da LPI

#6.1

12/05/1995

RPI 1305

Exigência - art. 36 da LPI

#6.1

09/27/1994

RPI 1243

Solicitação de exame técnico

#4.1

03/24/1992

RPI 1112

Publicação do pedido de patente

#3.1

02/13/1990

RPI 1006

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