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Official data from INPI

PROCESSO PARA REDUZIR A PORCENTAGEM DE CRISTAIS DE TRIIDRATO DE ALUMINA COM UM DIÂMETRO INFERIOR A 200 MICRONS, E, PROCESSO PARA REMOVER CRISTAIS DE OXALATO DE SODIO DE LICORES QUE FORAM USADOS NO PROCESSO BAYER

Em AnáliseInvention Patent

Application data

Number

PI8601795

Type

Invention Patent

Filing

04/23/1986

Publication

12/23/1986

Progress at the INPI

  1. Filing04/23/86
  2. Publication12/23/86
  3. Examination01/03/89
  4. Allowance09/17/91
  5. Grant06/30/92
  6. Expired07/22/08

The letters patent expired on 07/22/2008: 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: 01/03/1989. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Nalco Chemical Company

US

See this company's full portfolio

Inventors

J. P. (pessoa física)

US

W. R. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

726.544 · 04/24/1985

US

797717 · 11/13/1985

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Solicitação de exame técnico

#4.1

01/03/1989

RPI 950

14.7

03/31/1987

RPI 858

Publicação do pedido de patente

#3.1

12/23/1986

RPI 844

Pedido de patente depositado

#2.1

10/29/1986

RPI 836

Carta-patente expirada

#21.1

Patente extinta em 23/04/2001

07/22/2008

RPI 1959

Concessão da patente

#16.1

06/30/1992

RPI 1126

Notificação para pagamento de retribuição

#13.1

01/21/1992

RPI 1103

Deferimento

#9.1

09/17/1991

RPI 1085

Exigência - art. 36 da LPI

#6.1

01/08/1991

RPI 1049

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