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Official data from INPI

PROCESSO PARA RECUPERACAO E PURIFICACAO DE ACRILONITRILA OU METACRILONITRILA

ConcedidaInvention Patent

Application data

Number

PI8108536

Type

Invention Patent

Filing

12/31/1980

Publication

10/19/1982

Progress at the INPI

  1. Filing12/31/80
  2. Publication10/19/82
  3. Examination12/11/84
  4. Allowance07/08/86
  5. Grant03/31/87
  6. Expired08/19/08

The letters patent expired on 08/19/2008: 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: 03/31/1987. We update with every new RPI gazette, published weekly.

Applicants and inventors

Applicants

STANDARD OIL CO [US]

See this company's full portfolio

Inventors

H. W. (pessoa física)

Technical data

IPC Classification

Prosecution history

Publications in the Brazilian Industrial Property Gazette (RPI).

Concessão da patente

#16.1

03/31/1987

RPI 858

Notificação para pagamento de retribuição

#13.1

11/04/1986

RPI 837

Deferimento

#9.1

07/08/1986

RPI 820

Exigência - art. 36 da LPI

#6.1

10/22/1985

RPI 783

Solicitação de exame técnico

#4.1

12/11/1984

RPI 738

Publicação do pedido de patente

#3.1

10/19/1982

RPI 626

Pedido de patente depositado

#2.1

02/24/1982

RPI 592

Carta-patente expirada

#21.1

Patente extinta em 30/12/96

08/19/2008

RPI 1963

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