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Official data from INPI

PROCESSO PARA PRODUZIR SOLUCAO DE HIPOSSULFITO DE ALUMINIO

ConcedidaInvention Patent

Application data

Number

PI7902280

Type

Invention Patent

Filing

04/14/1978

Publication

-

Progress at the INPI

  1. Filing04/14/78
  2. Publication
  3. Examination
  4. Allowance08/30/83
  5. Grant03/27/84
  6. Expired06/21/94

The letters patent expired on 06/21/1994: 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: 03/27/1984. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

ENGELHARD MIN & CHEM

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Inventors

T. J. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

03/27/1984

RPI 701

Notificação para pagamento de retribuição

#13.1

12/20/1983

RPI 687

Deferimento

#9.1

08/30/1983

RPI 671

Exigência - art. 36 da LPI

#6.1

04/20/1982

RPI 600

Carta-patente expirada

#21.1

06/21/1994

RPI 1229

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