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Official data from INPI

PASTA DE ÓXIDO DE MAGNÉSIO PARA REVESTIMENTO DE AÇOS AO SILÍCIO E PROCESSO PARA PRODUÇÃO DE UM REVESTIMENTO ELETRICAMENTE ISOLANTE.

Arquivada/ExtintaInvention Patent

Application data

Number

PI9004444

Type

Invention Patent

Filing

09/06/1990

Publication

09/10/1991

Progress at the INPI

  1. Filing09/06/90
  2. Publication09/10/91
  3. Examination03/17/92
  4. Allowance01/05/99
  5. Grant08/10/99
  6. Expired01/29/13

The letters patent expired on 01/29/2013: 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: 01/29/2013. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Armco, Inc.

US

See this company's full portfolio

Inventors

R. M. (pessoa física)

US

W. W. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

404.714 · 09/08/1989

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Carta-patente expirada

#21.1

Patente extinta em 06/09/2010

01/29/2013

RPI 2195

Concessão da patente

#16.1

08/10/1999

RPI 1492

Deferimento

#9.1

01/05/1999

RPI 1461

6.2

03/12/1996

RPI 1319

Solicitação de exame técnico

#4.1

03/17/1992

RPI 1111

Publicação do pedido de patente

#3.1

09/10/1991

RPI 1084

Pedido de patente depositado

#2.1

03/12/1991

RPI 1058

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