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Official data from INPI

PROCESSO PARA A PREPARACAO DE POEIRAS RESIDUAIS CONTENDO DIOXIDO DE SILICIO PARA DAR ACIDO SILICICO DE PRECIPITACAO E SILICATOS

ConcedidaInvention Patent

Application data

Number

PI7701441

Type

Invention Patent

Filing

03/10/1976

Publication

-

Progress at the INPI

  1. Filing03/10/76
  2. Publication
  3. Examination
  4. Allowance08/23/83
  5. Grant03/27/84
  6. Expired07/27/93

The letters patent expired on 07/27/1993: 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: 03/27/1984. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

DEGUSSA

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Inventors

A. K. (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

12/13/1983

RPI 686

Deferimento

#9.1

08/23/1983

RPI 670

Exigência - art. 36 da LPI

#6.1

02/01/1983

RPI 641

Exigência - art. 36 da LPI

#6.1

12/22/1981

RPI 583

Carta-patente expirada

#21.1

07/27/1993

RPI 1182

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