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Official data from INPI

PROCESSO DE PREPARAÇÃO DE UM AGENTE FLOCULANTE DE ÁGUA E DESPEJOS HÍDRICOS E AUXILIAR DE DESIDRATAÇÃO DE LODO BIOLÓGICO

PublicadaInvention Patent

Application data

Number

PI8706877

Type

Invention Patent

Filing

12/17/1987

Publication

07/11/1989

Progress at the INPI

  1. Filing12/17/87
  2. Publication07/11/89
  3. Examination02/13/91
  4. Allowance09/28/93
  5. Grant06/28/94
  6. Expired07/29/08

The letters patent expired on 07/29/2008: 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: 07/11/1989. 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

C. C. (pessoa física)

BR

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

07/11/1989

RPI 977

Pedido de patente depositado

#2.1

01/31/1989

RPI 954

Carta-patente expirada

#21.1

Patente extinta em 17/12/2002

07/29/2008

RPI 1960

Concessão da patente

#16.1

06/28/1994

RPI 1230

Notificação para pagamento de retribuição

#13.1

03/08/1994

RPI 1214

Deferimento

#9.1

09/28/1993

RPI 1191

Solicitação de exame técnico

#4.1

02/13/1991

RPI 1054

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