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Official data from INPI

PROCESSO DE DESSULFURACAO DE GUSA E FERRO FUNDIDO LIQUIDO

Em AnáliseInvention Patent
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Application data

Number

PI7703802

Type

Invention Patent

Filing

06/13/1977

Publication

-
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Progress at the INPI

  1. Filing06/13/77
  2. Publication
  3. Examination
  4. Allowance12/22/81
  5. Grant
  6. Expired07/06/93

The letters patent expired on 07/06/1993: 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: 04/27/1982. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

ITALMAGNESIO SA CO SIDERURGICA

Inventors

No inventors listed.

Technical data

IPC Classification

No IPC classification.

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Notificação para pagamento de retribuição

#13.1

04/27/1982

RPI 601

Deferimento

#9.1

12/22/1981

RPI 583

Carta-patente expirada

#21.1

07/06/1993

RPI 1179

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