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Official data from INPI

PROCESSO PARA A PREPARAÇÃO DE SULFOMETILPOLIACRILAMIDA.

Em AnáliseInvention Patent

Application data

Number

PI8605891

Type

Invention Patent

Filing

12/02/1986

Publication

08/25/1987

Progress at the INPI

  1. Filing12/02/86
  2. Publication08/25/87
  3. Examination08/02/88
  4. Allowance02/24/93
  5. Grant08/31/93
  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: 08/02/1988. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

Nalco Chemical Company

US

See this company's full portfolio

Inventors

D. K. (pessoa física)

US

D. F. (pessoa física)

US

Technical data

IPC Classification

Priority claims

US

804,036 · 12/03/1985

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Solicitação de exame técnico

#4.1

08/02/1988

RPI 928

Publicação do pedido de patente

#3.1

08/25/1987

RPI 879

Pedido de patente depositado

#2.1

04/14/1987

RPI 860

Carta-patente expirada

#21.1

Patente extinta em 02/12/2001

07/22/2008

RPI 1959

Concessão da patente

#16.1

08/31/1993

RPI 1187

Notificação para pagamento de retribuição

#13.1

06/08/1993

RPI 1175

Deferimento

#9.1

02/24/1993

RPI 1160

Exigência - art. 36 da LPI

#6.1

11/05/1991

RPI 1092

6.2

08/07/1990

RPI 1027

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