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Official data from INPI

PROCESSO PARA RECUPERAÇÃO DE OURO

PublicadaInvention Patent

Application data

Number

PI8800437

Type

Invention Patent

Filing

02/04/1988

Publication

09/20/1988

Progress at the INPI

  1. Filing02/04/88
  2. Publication09/20/88
  3. Examination10/09/90
  4. Allowance01/03/95
  5. Grant06/27/95
  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.

Talk to a specialist

Latest action published by the INPI: 09/20/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Nalco Chemical Company

US

See this company's full portfolio

Inventors

R. S. (pessoa física)

US

R. D. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

011,659 · 02/05/1987

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Publicação do pedido de patente

#3.1

09/20/1988

RPI 935

Pedido de patente depositado

#2.1

05/31/1988

RPI 919

Republicação - classificação IPC

#15.11

Procedimento automático de reclassificação. A classificação IPC anterior era C22B 11/04.

03/20/2018

RPI 2463

Carta-patente expirada

#21.1

Patente extinta em 04/02/2003

09/02/2008

RPI 1965

Concessão da patente

#16.1

06/27/1995

RPI 1282

Deferimento

#9.1

01/03/1995

RPI 1257

Solicitação de exame técnico

#4.1

10/09/1990

RPI 1036

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