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Official data from INPI

UNIDADE DE SUPERVISÃO DO CIRCUITO DE CONTROLE DE ELETROIMÃS

PublicadaInvention Patent

Application data

Number

PI8800735

Type

Invention Patent

Filing

02/23/1988

Publication

09/19/1989

Progress at the INPI

  1. Filing02/23/88
  2. Publication09/19/89
  3. Examination04/23/91
  4. Allowance11/07/95
  5. Grant07/30/96
  6. Expired09/02/08

The letters patent expired on 09/02/2008: 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

Usinas Siderúrgicas de Minas Gerais S/A - Usiminas

MG, BR

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Inventors

J. F. (pessoa física)

BR

K. M. (pessoa física)

BR

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

09/19/1989

RPI 987

Pedido de patente depositado

#2.1

05/10/1988

RPI 916

Carta-patente expirada

#21.1

Patente extinta em 23/02/2003

09/02/2008

RPI 1965

Concessão da patente

#16.1

07/30/1996

RPI 1339

Deferimento

#9.1

11/07/1995

RPI 1301

Solicitação de exame técnico

#4.1

04/23/1991

RPI 1064

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